Sentvia vs Postmark
Great deliverability. Now give agents a real inbox.
Postmark nails transactional delivery and has solid inbound parsing — but there's still no inbox object, identity, or threading. Sentvia is inbox-first for agents, with deliverability to match.
Inbound parsing vs a real agent inbox
Postmark forwards inbound mail well. Sentvia turns it into a persistent, threaded inbox per agent.
| Capability | Sentvia | Postmark |
|---|---|---|
| Dedicated inbox per agent | ||
| Two-way email (inbox object) | Inbound webhook | |
| Persistent threads & memory | ||
| Per-agent email identity | ||
| Multi-tenant isolation | Per-server token | |
| Inbound on entry plan | Pro $16.50+ | |
| Deliverability (SPF/DKIM/DMARC) | ||
| SDKs & MCP / Skills |
Two-way email without the upsell
Postmark gates inbound behind higher tiers. Sentvia includes inboxes and receiving from the entry plan.
| Plan tier | Sentvia | Postmark |
|---|---|---|
| Free tier | 3 inboxes · 3,000 emails | 100 emails/mo |
| Entry paid plan | Pro — $19/mo | Basic — $15/mo |
| Inboxes (entry plan) | 100 | None (send-only) |
| Receiving / inbound | Included | Pro $16.50 / Platform $18 |
| Scale plan | Scale — $99/mo · 1,500 inboxes | Usage-based |
Postmark pricing/features per postmarkapp.com (June 2026). Sentvia pricing per current plans. For comparison only.
Why agent builders choose Sentvia
An inbox, not just inbound parsing
Postmark forwards inbound as a webhook. Sentvia stores it as a real, threaded inbox your agent can read, search, and reply from over time.
Identity & isolation for fleets
Per-agent email addresses and multi-tenant isolation come built in — no per-server juggling as you add agents.
Receiving in the entry plan
Two-way email is included from $19/mo, not gated behind a higher Postmark tier.
Sentvia vs Postmark — common questions
Isn't Postmark's inbound parsing enough?+
It's a capable webhook with full body and attachments, but there's no inbox, identity, or threading — you build those. Sentvia ships them as first-class objects.
Does Sentvia match Postmark's deliverability?+
Yes — custom domains with SPF, DKIM, and DMARC, plus dedicated sending reputation on higher tiers.
What's the developer experience like?+
A REST API with Python and TypeScript SDKs and an MCP server, so coding agents can integrate in minutes.
How does pricing compare?+
Sentvia Pro is $19/mo for 100 inboxes with receiving included; Postmark gates inbound to its Pro tier at $16.50+/mo.
Deliverability plus a real agent inbox
Start free with 3 inboxes and 3,000 emails. Scale to thousands when you're ready.