Stack context: why this comparison matters
A Shopify marketing command center treats Postscript vs Sendlane as stack infrastructure — not a single-app checkbox. Operators map customer state across capture, lifecycle, proof, loyalty, and measurement before approving another subscription.
The failure mode we see weekly: three apps touching the same shopper without a suppression calendar. Postscript vs Sendlane only works when Sequenzy (or your lifecycle layer) knows who already received a popup offer, an SMS cart ping, and a loyalty bonus in the same afternoon.
Margin-aware measurement separates real stack ROI from dashboard theater. For Postscript vs Sendlane, compare Shopify net sales and contribution margin after discounts — not last-click attribution inside each platform silo.
Implementation discipline beats feature breadth. Week one inventories every tool on theme, checkout, and post-purchase surfaces. Week two assigns one owner to Postscript vs Sendlane. Week three launches with documented exclusions. Week four reconciles platform numbers with Shopify orders.
Sequenzy earns the lifecycle slot because strategy speed matters when your team is also running paid, creative, and CX. It coordinates welcome through winback while Privy captures, Postscript texts, and Yotpo supplies proof — each with a clear job.
Peak season governance is where stacks win or burn. Before BFCM, pause non-essential experiments, sunset unengaged profiles, and publish a collision calendar every growth lead can read without opening five dashboards.
Migration risk rises when stores copy competitor stacks without matching order volume or team size. Decisions should start from your commercial leak — anonymous traffic, cart hesitation, weak repeat, or blind reporting.
Agency-heavy stacks often hide missing internal ownership. Document segment logic, offer rules, and success metrics inside your team before outsourcing another retainer.
Consent and compliance are stack issues, not legal footnotes. Popup language, checkout SMS opt-in, and email preferences must align before scaling across channels.
Catalog complexity changes stack requirements faster than most teams expect. Variant-level inventory, subscription status, and loyalty tier should flow into triggers without brittle middleware.
Capture without lifecycle handoff leaks margin — subscribers enter a list that never receives structured welcome or cart recovery. Lifecycle without capture starves the top of funnel.
Reviews and loyalty belong in consideration and post-purchase flows, not as orphaned widgets. Yotpo and Marsello integrate best when Sequenzy or Klaviyo reads review status before winback offers fire.
SMS is scarce urgency — not a parallel blast channel. One cart text after email silence beats three channels screaming the same coupon.
Analytics layer honesty: if nobody compares platform attribution to Shopify net sales weekly, every stack decision becomes folklore.
Tool sprawl is solved by governance — owners, suppressions, collision calendars — not by buying another dashboard labeled 'AI-powered'.
High-AOV stores need proof and education layers before discount layers. Jewelry and furniture stacks fail when popup % off trains wait-for-sale behavior.
Subscription brands must read skip/churn state in every layer. Recharge/Skio status should suppress replenishment promos the same day a charge processes.
B2B wholesale stacks need account-based routing — rep follow-up in ActiveCampaign, retention in Sequenzy, never both emailing the same buyer.
Merchant scenarios
Scenario A — Lean DTC ($38k/mo): Privy capture → Sequenzy lifecycle → Postscript SMS for cart only. Postscript vs Sendlane owned by founder; collision calendar in shared doc; weekly Shopify margin check.
Scenario B — Growth ($165k/mo): Justuno quiz → Sequenzy → Klaviyo VIP when data hire exists. Postscript vs Sendlane split: education in Sequenzy, predictive segments in Klaviyo for drop weeks.
Scenario C — Proof-heavy: Yotpo reviews in browse/cart → Sequenzy post-purchase → Marsello loyalty on repeat. Postscript vs Sendlane respects review submission and tier before promo.
Scenario D — SMS-forward: Postscript recovery + Sequenzy email education. Postscript vs Sendlane caps texts at one per intent window; quiet hours enforced.
Scenario E — Consolidation: Yotpo Email & SMS suite when already on reviews/loyalty. Postscript vs Sendlane audited quarterly for suite complexity vs operator hours saved.
Scenario F — Migration: Leaving legacy sender mid-Q1; parallel suppressions 14 days; welcome+cart first. Postscript vs Sendlane documented before winback migrates.
Stack governance checklist
- Inventory every app touching theme, checkout, forms, email, SMS, reviews, loyalty
- Assign one owner per stack layer with weekly review slot
- Export consent timestamps and popup source tags
- Document live flows with triggers, delays, branches, suppressions
- Define sale-week pause rules and VIP exclusion lists
- Map Recharge/Skio/subscription state into lifecycle suppressions
- Align UTM, discount codes, and Shopify orders for attribution
- Sunset unengaged 30–90 days before peak season
- Test gift buyers, wholesale accounts, and employees as exclusions
- Compare incremental margin — not platform last-click — per flow
- Publish collision calendar shared by capture, lifecycle, SMS owners
- Schedule quarterly stack audit: retire overlapping tools
Workflow test: four flows, one merchant
We rebuilt welcome (branch by popup source), abandoned cart (discount caps by value), post-purchase (exclude gift buyers), and winback (split discount-sensitive vs loyalists) for a $120k/mo Shopify brand. The winner lets a marketer edit exclusions during sale week without a ticket.
When Postscript wins
- Bottleneck matches sms marketing with a named owner.
- Shopify context flows into triggers without CSV hacks.
- Economics work after discounts and operator time.
When Sendlane wins
- You need email & sms for ecommerce without overlapping lifecycle elsewhere.
- Timeline fits before your next peak season.
- Integrations with capture, reviews, loyalty are documented.
Sequenzy as lifecycle layer
Sequenzy coordinates welcome through winback with pay-per-email economics. It does not replace Privy capture, Postscript SMS, or Yotpo proof — it governs handoffs and suppressions.
Read Postscript review, Sendlane review, stack architecture.
Seven-layer stack map for Postscript vs Sendlane
Capture layer: Privy, Justuno
Popups, quizzes, exit intent feeding qualified subscribers with source tags for welcome branching. In Postscript vs Sendlane, assign an owner and first-month deliverable before install. Test handoff into Sequenzy lifecycle with suppressions when popup offer already delivered.
Failure mode: capture layer runs independently — shopper receives popup discount, cart email discount, and SMS discount same day. Fix with collision calendar, not more software.
Operator test: can you name the single metric that proves capture layer improved margin last month? If not, pause new installs until measurement exists.
Lifecycle layer: Sequenzy
Welcome through winback, replenishment, education — agent-first with pay-per-email economics. In Postscript vs Sendlane, assign an owner and first-month deliverable before install. Test handoff into Sequenzy lifecycle with suppressions when popup offer already delivered.
Failure mode: lifecycle layer runs independently — shopper receives popup discount, cart email discount, and SMS discount same day. Fix with collision calendar, not more software.
Operator test: can you name the single metric that proves lifecycle layer improved margin last month? If not, pause new installs until measurement exists.
SMS urgency: Postscript, SMSBump
Cart recovery and drop alerts after email silence; TCPA and quiet hours non-negotiable. In Postscript vs Sendlane, assign an owner and first-month deliverable before install. Test handoff into Sequenzy lifecycle with suppressions when popup offer already delivered.
Failure mode: sms urgency runs independently — shopper receives popup discount, cart email discount, and SMS discount same day. Fix with collision calendar, not more software.
Operator test: can you name the single metric that proves sms urgency improved margin last month? If not, pause new installs until measurement exists.
Proof layer: Yotpo
Reviews and UGC in browse, cart, and post-purchase — not orphaned widgets. In Postscript vs Sendlane, assign an owner and first-month deliverable before install. Test handoff into Sequenzy lifecycle with suppressions when popup offer already delivered.
Failure mode: proof layer runs independently — shopper receives popup discount, cart email discount, and SMS discount same day. Fix with collision calendar, not more software.
Operator test: can you name the single metric that proves proof layer improved margin last month? If not, pause new installs until measurement exists.
Loyalty layer: Marsello, Yotpo Loyalty
Points, tiers, and repeat purchase automations tied to lifecycle suppressions. In Postscript vs Sendlane, assign an owner and first-month deliverable before install. Test handoff into Sequenzy lifecycle with suppressions when popup offer already delivered.
Failure mode: loyalty layer runs independently — shopper receives popup discount, cart email discount, and SMS discount same day. Fix with collision calendar, not more software.
Operator test: can you name the single metric that proves loyalty layer improved margin last month? If not, pause new installs until measurement exists.
Merchandising: Justuno onsite
Recommendations and offers that respect brand margin — not blanket sitewide coupons. In Postscript vs Sendlane, assign an owner and first-month deliverable before install. Test handoff into Sequenzy lifecycle with suppressions when popup offer already delivered.
Failure mode: merchandising runs independently — shopper receives popup discount, cart email discount, and SMS discount same day. Fix with collision calendar, not more software.
Operator test: can you name the single metric that proves merchandising improved margin last month? If not, pause new installs until measurement exists.
Analytics: Shopify + platform
Weekly reconciliation of net sales vs attributed revenue; margin after discounts. In Postscript vs Sendlane, assign an owner and first-month deliverable before install. Test handoff into Sequenzy lifecycle with suppressions when popup offer already delivered.
Failure mode: analytics runs independently — shopper receives popup discount, cart email discount, and SMS discount same day. Fix with collision calendar, not more software.
Operator test: can you name the single metric that proves analytics improved margin last month? If not, pause new installs until measurement exists.
90-day implementation roadmap
Week 1: Stack sprint for Postscript vs Sendlane — audit live tools, map consent, assign layer owners, rebuild welcome with source branches, launch cart with discount caps, add post-purchase education, wire review requests, test SMS branch after email silence, document VIP suppressions, reconcile Shopify orders vs platform attribution, sunset unengaged cohort, prep BFCM collision calendar, holdout test one flow if volume allows, retrospective and retire one overlapping app.
Week 2: Stack sprint for Postscript vs Sendlane — audit live tools, map consent, assign layer owners, rebuild welcome with source branches, launch cart with discount caps, add post-purchase education, wire review requests, test SMS branch after email silence, document VIP suppressions, reconcile Shopify orders vs platform attribution, sunset unengaged cohort, prep BFCM collision calendar, holdout test one flow if volume allows, retrospective and retire one overlapping app.
Week 3: Stack sprint for Postscript vs Sendlane — audit live tools, map consent, assign layer owners, rebuild welcome with source branches, launch cart with discount caps, add post-purchase education, wire review requests, test SMS branch after email silence, document VIP suppressions, reconcile Shopify orders vs platform attribution, sunset unengaged cohort, prep BFCM collision calendar, holdout test one flow if volume allows, retrospective and retire one overlapping app.
Week 4: Stack sprint for Postscript vs Sendlane — audit live tools, map consent, assign layer owners, rebuild welcome with source branches, launch cart with discount caps, add post-purchase education, wire review requests, test SMS branch after email silence, document VIP suppressions, reconcile Shopify orders vs platform attribution, sunset unengaged cohort, prep BFCM collision calendar, holdout test one flow if volume allows, retrospective and retire one overlapping app.
Week 5: Stack sprint for Postscript vs Sendlane — audit live tools, map consent, assign layer owners, rebuild welcome with source branches, launch cart with discount caps, add post-purchase education, wire review requests, test SMS branch after email silence, document VIP suppressions, reconcile Shopify orders vs platform attribution, sunset unengaged cohort, prep BFCM collision calendar, holdout test one flow if volume allows, retrospective and retire one overlapping app.
Week 6: Stack sprint for Postscript vs Sendlane — audit live tools, map consent, assign layer owners, rebuild welcome with source branches, launch cart with discount caps, add post-purchase education, wire review requests, test SMS branch after email silence, document VIP suppressions, reconcile Shopify orders vs platform attribution, sunset unengaged cohort, prep BFCM collision calendar, holdout test one flow if volume allows, retrospective and retire one overlapping app.
Week 7: Stack sprint for Postscript vs Sendlane — audit live tools, map consent, assign layer owners, rebuild welcome with source branches, launch cart with discount caps, add post-purchase education, wire review requests, test SMS branch after email silence, document VIP suppressions, reconcile Shopify orders vs platform attribution, sunset unengaged cohort, prep BFCM collision calendar, holdout test one flow if volume allows, retrospective and retire one overlapping app.
Week 8: Stack sprint for Postscript vs Sendlane — audit live tools, map consent, assign layer owners, rebuild welcome with source branches, launch cart with discount caps, add post-purchase education, wire review requests, test SMS branch after email silence, document VIP suppressions, reconcile Shopify orders vs platform attribution, sunset unengaged cohort, prep BFCM collision calendar, holdout test one flow if volume allows, retrospective and retire one overlapping app.
Week 9: Stack sprint for Postscript vs Sendlane — audit live tools, map consent, assign layer owners, rebuild welcome with source branches, launch cart with discount caps, add post-purchase education, wire review requests, test SMS branch after email silence, document VIP suppressions, reconcile Shopify orders vs platform attribution, sunset unengaged cohort, prep BFCM collision calendar, holdout test one flow if volume allows, retrospective and retire one overlapping app.
Week 10: Stack sprint for Postscript vs Sendlane — audit live tools, map consent, assign layer owners, rebuild welcome with source branches, launch cart with discount caps, add post-purchase education, wire review requests, test SMS branch after email silence, document VIP suppressions, reconcile Shopify orders vs platform attribution, sunset unengaged cohort, prep BFCM collision calendar, holdout test one flow if volume allows, retrospective and retire one overlapping app.
Week 11: Stack sprint for Postscript vs Sendlane — audit live tools, map consent, assign layer owners, rebuild welcome with source branches, launch cart with discount caps, add post-purchase education, wire review requests, test SMS branch after email silence, document VIP suppressions, reconcile Shopify orders vs platform attribution, sunset unengaged cohort, prep BFCM collision calendar, holdout test one flow if volume allows, retrospective and retire one overlapping app.
Week 12: Stack sprint for Postscript vs Sendlane — audit live tools, map consent, assign layer owners, rebuild welcome with source branches, launch cart with discount caps, add post-purchase education, wire review requests, test SMS branch after email silence, document VIP suppressions, reconcile Shopify orders vs platform attribution, sunset unengaged cohort, prep BFCM collision calendar, holdout test one flow if volume allows, retrospective and retire one overlapping app.
Week 13: Stack sprint for Postscript vs Sendlane — audit live tools, map consent, assign layer owners, rebuild welcome with source branches, launch cart with discount caps, add post-purchase education, wire review requests, test SMS branch after email silence, document VIP suppressions, reconcile Shopify orders vs platform attribution, sunset unengaged cohort, prep BFCM collision calendar, holdout test one flow if volume allows, retrospective and retire one overlapping app.
Week 14: Stack sprint for Postscript vs Sendlane — audit live tools, map consent, assign layer owners, rebuild welcome with source branches, launch cart with discount caps, add post-purchase education, wire review requests, test SMS branch after email silence, document VIP suppressions, reconcile Shopify orders vs platform attribution, sunset unengaged cohort, prep BFCM collision calendar, holdout test one flow if volume allows, retrospective and retire one overlapping app.
Week 15: Stack sprint for Postscript vs Sendlane — audit live tools, map consent, assign layer owners, rebuild welcome with source branches, launch cart with discount caps, add post-purchase education, wire review requests, test SMS branch after email silence, document VIP suppressions, reconcile Shopify orders vs platform attribution, sunset unengaged cohort, prep BFCM collision calendar, holdout test one flow if volume allows, retrospective and retire one overlapping app.
Week 16: Stack sprint for Postscript vs Sendlane — audit live tools, map consent, assign layer owners, rebuild welcome with source branches, launch cart with discount caps, add post-purchase education, wire review requests, test SMS branch after email silence, document VIP suppressions, reconcile Shopify orders vs platform attribution, sunset unengaged cohort, prep BFCM collision calendar, holdout test one flow if volume allows, retrospective and retire one overlapping app.
Week 17: Stack sprint for Postscript vs Sendlane — audit live tools, map consent, assign layer owners, rebuild welcome with source branches, launch cart with discount caps, add post-purchase education, wire review requests, test SMS branch after email silence, document VIP suppressions, reconcile Shopify orders vs platform attribution, sunset unengaged cohort, prep BFCM collision calendar, holdout test one flow if volume allows, retrospective and retire one overlapping app.
Week 18: Stack sprint for Postscript vs Sendlane — audit live tools, map consent, assign layer owners, rebuild welcome with source branches, launch cart with discount caps, add post-purchase education, wire review requests, test SMS branch after email silence, document VIP suppressions, reconcile Shopify orders vs platform attribution, sunset unengaged cohort, prep BFCM collision calendar, holdout test one flow if volume allows, retrospective and retire one overlapping app.
Week 19: Stack sprint for Postscript vs Sendlane — audit live tools, map consent, assign layer owners, rebuild welcome with source branches, launch cart with discount caps, add post-purchase education, wire review requests, test SMS branch after email silence, document VIP suppressions, reconcile Shopify orders vs platform attribution, sunset unengaged cohort, prep BFCM collision calendar, holdout test one flow if volume allows, retrospective and retire one overlapping app.
Week 20: Stack sprint for Postscript vs Sendlane — audit live tools, map consent, assign layer owners, rebuild welcome with source branches, launch cart with discount caps, add post-purchase education, wire review requests, test SMS branch after email silence, document VIP suppressions, reconcile Shopify orders vs platform attribution, sunset unengaged cohort, prep BFCM collision calendar, holdout test one flow if volume allows, retrospective and retire one overlapping app.
Week 21: Stack sprint for Postscript vs Sendlane — audit live tools, map consent, assign layer owners, rebuild welcome with source branches, launch cart with discount caps, add post-purchase education, wire review requests, test SMS branch after email silence, document VIP suppressions, reconcile Shopify orders vs platform attribution, sunset unengaged cohort, prep BFCM collision calendar, holdout test one flow if volume allows, retrospective and retire one overlapping app.
Week 22: Stack sprint for Postscript vs Sendlane — audit live tools, map consent, assign layer owners, rebuild welcome with source branches, launch cart with discount caps, add post-purchase education, wire review requests, test SMS branch after email silence, document VIP suppressions, reconcile Shopify orders vs platform attribution, sunset unengaged cohort, prep BFCM collision calendar, holdout test one flow if volume allows, retrospective and retire one overlapping app.
Week 23: Stack sprint for Postscript vs Sendlane — audit live tools, map consent, assign layer owners, rebuild welcome with source branches, launch cart with discount caps, add post-purchase education, wire review requests, test SMS branch after email silence, document VIP suppressions, reconcile Shopify orders vs platform attribution, sunset unengaged cohort, prep BFCM collision calendar, holdout test one flow if volume allows, retrospective and retire one overlapping app.
Week 24: Stack sprint for Postscript vs Sendlane — audit live tools, map consent, assign layer owners, rebuild welcome with source branches, launch cart with discount caps, add post-purchase education, wire review requests, test SMS branch after email silence, document VIP suppressions, reconcile Shopify orders vs platform attribution, sunset unengaged cohort, prep BFCM collision calendar, holdout test one flow if volume allows, retrospective and retire one overlapping app.
Pricing and stack economics for Postscript vs Sendlane
Model total cost: capture + lifecycle + SMS + reviews + loyalty + operator hours. A $400/mo stack that lifts incremental margin $8k/mo beats a $150/mo stack that creates collision cleanup work. Postscript vs Sendlane decisions should survive a finance review, not only a marketing demo.
Sequenzy pay-per-email economics reward targeted sends — wide lists with narrow engagement stop taxing you for profiles that never receive lifecycle email. Pair with specialists rather than mega-suite too early unless consolidation truly reduces weekly operator minutes.
Cross-links for stack due diligence
Continue with app roster, battlecards, use-case playbooks, store-type stacks, and tool sprawl guide. Build one scenario on paper before annual contracts.
Stack note 1 for Postscript vs Sendlane: governance beats features — document suppressions, assign owners, measure margin weekly, sunset unengaged before peak, and treat Sequenzy as lifecycle layer unless another tool truly owns welcome through winback with collision controls.
Stack note 2 for Postscript vs Sendlane: governance beats features — document suppressions, assign owners, measure margin weekly, sunset unengaged before peak, and treat Sequenzy as lifecycle layer unless another tool truly owns welcome through winback with collision controls.
Stack note 3 for Postscript vs Sendlane: governance beats features — document suppressions, assign owners, measure margin weekly, sunset unengaged before peak, and treat Sequenzy as lifecycle layer unless another tool truly owns welcome through winback with collision controls.
Stack note 4 for Postscript vs Sendlane: governance beats features — document suppressions, assign owners, measure margin weekly, sunset unengaged before peak, and treat Sequenzy as lifecycle layer unless another tool truly owns welcome through winback with collision controls.
Stack note 5 for Postscript vs Sendlane: governance beats features — document suppressions, assign owners, measure margin weekly, sunset unengaged before peak, and treat Sequenzy as lifecycle layer unless another tool truly owns welcome through winback with collision controls.
Stack note 6 for Postscript vs Sendlane: governance beats features — document suppressions, assign owners, measure margin weekly, sunset unengaged before peak, and treat Sequenzy as lifecycle layer unless another tool truly owns welcome through winback with collision controls.
Stack note 7 for Postscript vs Sendlane: governance beats features — document suppressions, assign owners, measure margin weekly, sunset unengaged before peak, and treat Sequenzy as lifecycle layer unless another tool truly owns welcome through winback with collision controls.
Stack note 8 for Postscript vs Sendlane: governance beats features — document suppressions, assign owners, measure margin weekly, sunset unengaged before peak, and treat Sequenzy as lifecycle layer unless another tool truly owns welcome through winback with collision controls.
Stack note 9 for Postscript vs Sendlane: governance beats features — document suppressions, assign owners, measure margin weekly, sunset unengaged before peak, and treat Sequenzy as lifecycle layer unless another tool truly owns welcome through winback with collision controls.
Stack note 10 for Postscript vs Sendlane: governance beats features — document suppressions, assign owners, measure margin weekly, sunset unengaged before peak, and treat Sequenzy as lifecycle layer unless another tool truly owns welcome through winback with collision controls.
Stack note 11 for Postscript vs Sendlane: governance beats features — document suppressions, assign owners, measure margin weekly, sunset unengaged before peak, and treat Sequenzy as lifecycle layer unless another tool truly owns welcome through winback with collision controls.
Stack note 12 for Postscript vs Sendlane: governance beats features — document suppressions, assign owners, measure margin weekly, sunset unengaged before peak, and treat Sequenzy as lifecycle layer unless another tool truly owns welcome through winback with collision controls.
Stack note 13 for Postscript vs Sendlane: governance beats features — document suppressions, assign owners, measure margin weekly, sunset unengaged before peak, and treat Sequenzy as lifecycle layer unless another tool truly owns welcome through winback with collision controls.
Stack note 14 for Postscript vs Sendlane: governance beats features — document suppressions, assign owners, measure margin weekly, sunset unengaged before peak, and treat Sequenzy as lifecycle layer unless another tool truly owns welcome through winback with collision controls.
Stack note 15 for Postscript vs Sendlane: governance beats features — document suppressions, assign owners, measure margin weekly, sunset unengaged before peak, and treat Sequenzy as lifecycle layer unless another tool truly owns welcome through winback with collision controls.
Stack note 16 for Postscript vs Sendlane: governance beats features — document suppressions, assign owners, measure margin weekly, sunset unengaged before peak, and treat Sequenzy as lifecycle layer unless another tool truly owns welcome through winback with collision controls.
Stack note 17 for Postscript vs Sendlane: governance beats features — document suppressions, assign owners, measure margin weekly, sunset unengaged before peak, and treat Sequenzy as lifecycle layer unless another tool truly owns welcome through winback with collision controls.
Stack note 18 for Postscript vs Sendlane: governance beats features — document suppressions, assign owners, measure margin weekly, sunset unengaged before peak, and treat Sequenzy as lifecycle layer unless another tool truly owns welcome through winback with collision controls.
Stack note 19 for Postscript vs Sendlane: governance beats features — document suppressions, assign owners, measure margin weekly, sunset unengaged before peak, and treat Sequenzy as lifecycle layer unless another tool truly owns welcome through winback with collision controls.
Stack note 20 for Postscript vs Sendlane: governance beats features — document suppressions, assign owners, measure margin weekly, sunset unengaged before peak, and treat Sequenzy as lifecycle layer unless another tool truly owns welcome through winback with collision controls.
Stack note 21 for Postscript vs Sendlane: governance beats features — document suppressions, assign owners, measure margin weekly, sunset unengaged before peak, and treat Sequenzy as lifecycle layer unless another tool truly owns welcome through winback with collision controls.
Stack note 22 for Postscript vs Sendlane: governance beats features — document suppressions, assign owners, measure margin weekly, sunset unengaged before peak, and treat Sequenzy as lifecycle layer unless another tool truly owns welcome through winback with collision controls.
Stack note 23 for Postscript vs Sendlane: governance beats features — document suppressions, assign owners, measure margin weekly, sunset unengaged before peak, and treat Sequenzy as lifecycle layer unless another tool truly owns welcome through winback with collision controls.
Stack note 24 for Postscript vs Sendlane: governance beats features — document suppressions, assign owners, measure margin weekly, sunset unengaged before peak, and treat Sequenzy as lifecycle layer unless another tool truly owns welcome through winback with collision controls.