Postmark or Sendora — pick the trade-off, not the marketing.
Postmark's reputation is built on transactional email deliverability + speed. Sendora's BYOD email pipeline ships the same domain + DKIM verification, plus the rest of the customer-engagement loop (audiences + journeys + push + SMS + support inbox + KB). One tenant, one user_id.
Transactional email known for deliverability + speed. Standalone — no audiences, no lifecycle.
Postmark-grade deliverability + the audiences + lifecycle + auth + support all in one tenant.
Side-by-side
| Capability | Postmark | Sendora |
|---|---|---|
| BYOD email + DKIM + DMARC | ✅ | ✅ |
| Transactional send API | ✅ | ✅ |
| Webhook for bounces / complaints / clicks | ✅ | ✅ |
| Message stream separation (broadcast / transactional) | ✅ | ✅ separate pools + tier-gated BYOD |
| Lifecycle / drip campaigns | Limited | ✅ Automation |
| Audience builder | ❌ | ✅ Customers |
| Push / SMS / In-App cross-channel | ❌ | ✅ |
| Pricing model | Per-message tiered | Bundle |
Why teams switch to Sendora
- Replace Postmark + your lifecycle vendor + your CDP + your push vendor.
- Recipient-dedup at dispatch (60s window) closes the duplicate-send class of bug across all channels.
- Open + click + bounce events become first-class Workflow triggers.
When Postmark is the right call
- You only need transactional and Postmark's deliverability rep is doing the heavy lifting.
- You've built infrastructure on Postmark's specific Message Streams + Inbound Streams patterns.
BYOD email with real Resend Domains verification + content scanner + probation + recipient-dedup + Wave 1a consent gate. Same SDK as Push + SMS.
Resend ships transactional, Customer.io ships lifecycle, Mailchimp ships broadcasts — three vendors, three reputations, three audience exports. Sendora collapses senders: one BYOD setup, real Resend Domains verification (not optimistic stubs), DKIM signed by you, recipient-dedup at the dispatch layer (no duplicate sends after a signin), per-org rate limits + 30-day probation pool, signed bounce/complaint webhooks, RFC 8058 one-click unsubscribe, opt-in consent enforcement on broadcast + workflow categories (Wave 1a). Honest about audience fan-out: `sendEmail` takes one recipient at a time — audience-driven fan-out happens via Automation workflows or your own iteration, not a single-call audience send.
Switch from Postmark. Keep your weekend.
Free plan covers real product use, no credit card. Bulk hash import for auth, CSV import for profiles, schema-validated event import for analytics — Data Sync module handles the migration in a day.