The short answer
- Moving from AgentMail Developer to Resend (free tier) saves $190 in the first year, after setup and upkeep time (Stackcut's model: modeled, not measured).
- Resend's community migration guide moves 3 partly; 6 things stay behind. What moves
- 7 public accounts of making this switch: 4 evaluated, 2 switched, 1 switching. Read them
- Switching help: Resend for YC Startups: current YC batch founders receive $25,000 in Resend credits valid 12 months, and YC alumni receive $15,000 in credits, plus a dedicated Slack channel with Resend's team. Not conditioned on switching from any specific vendor. resend.com
What AgentMail and Resend cost
List prices from each vendor's pricing page, as stored in the Stackcut catalog. Each price links its source.
| Plan | Billed monthly | Billed yearly (per month) | What you get |
|---|---|---|---|
| AgentMail Developer | $20/mo | not shown | 10 inboxes, 10,000 emails/mo, 10 GB storage, 10 custom domains; add-ons $2/mo per inbox or domain and $2 per 1,000 emails |
| AgentMail Startup | $200/mo | not shown | 150 inboxes, 150 custom domains; add-ons $2/mo per inbox or domain and $2 per 1,000 emails |
| Resend Pro | $20/mo | not shown | 50,000 emails/mo, no daily limit, 10 domains, 5 webhook endpoints; overage $0.90 per 1,000 |
| Resend Scale | $90/mo | not shown | 100,000 emails/mo, 1,000 domains, 10 webhook endpoints; overage $0.90 per 1,000; SSO and dedicated IP add-ons |
| Resend Pro 100k | $35/mo | not shown | 100,000 emails/mo, 10 domains; overage $0.90 per 1,000 |
| Resend Scale 200k | $160/mo | not shown | 200,000 emails/mo, 1,000 domains; overage $0.80 per 1,000 |
- AgentMail free plan: 3 inboxes, 3,000 emails/mo, 3 GB storage; no custom domains listed agentmail.to
- Resend free plan: 3,000 emails/mo, 100 emails/day, 3 domains, 30-day data retention; no pay-as-you-go on Free resend.com
Moving from AgentMail to Resend
What Resend's importer carries over, what it leaves behind, and any help it offers switchers.
To Resend
Community guide getfluxly.com · Tools: AgentMail REST API, Custom export script, Resend Inbound + Received Emails API, MX record changes
Moves: Outbound sending code (partial); Message history (threads, bodies, attachments) (partial); Inbound webhook consumers (partial). getfluxly.com
Doesn't move: Conversation threading; AgentMail inbox identities on @agentmail.to (addresses are not portable); Pod-based tenant isolation (rebuild as routing logic on Resend's catch-all); Semantic search over message history; WebSocket delivery (Resend inbound is webhook/poll only); MCP inbox tools tuned to AgentMail's reply API. getfluxly.com
Watch out for:
- No official AgentMail-to-Resend importer or migration doc exists on either vendor's site; the path is API export plus rebuilding inbox logic yourself. getfluxly.com
- The email.received webhook payload is metadata only (no body or attachment bytes); content requires follow-up API calls keyed on data.email_id. getfluxly.com
- Inbound retention is murky: competitor comparisons cite 30 days, but GetFluxly notes Resend's public docs do not state a retention period - confirm with Resend support before relying on it. getfluxly.com
Switching help: Resend for YC Startups: current YC batch founders receive $25,000 in Resend credits valid 12 months, and YC alumni receive $15,000 in credits, plus a dedicated Slack channel with Resend's team. Not conditioned on switching from any specific vendor. resend.com
Switching help: Resend Insiders, an ambassador program for content creators, power users and open-source contributors, gives members a free Resend Pro subscription plus early access, swag and direct access to the Resend team; the first cohort is a small group and requires applying. resend.com
Switching help: Resend's Enterprise (Custom) plan includes 'Personalized migration support' alongside a 99.99% uptime SLA, guaranteed response times and a dedicated CSM. Not specific to Mailgun switchers. resend.com
From each destination's own migration docs and switching pages, plus community write-ups where no official guide exists, each checked against its page. Confirm terms on the linked page before you rely on an offer.
People who moved from AgentMail to Resend
7 public accounts of leaving AgentMail: 4 evaluated, 2 switched, 1 switching. Summaries are ours; each links the original, and each was checked against its page before it appeared here.
A deliverability-tooling vendor's review gives AgentMail 8/10 as an agent email API while stressing it is a different category from cold-outreach infrastructure; it notes some third-party directories still list a stale $100 Starter price. InboxKit
In the Launch HN thread, a commenter reports they attempted to build their own agent email infrastructure before switching to AgentMail, calling the problem much harder than expected. Hacker News
A Hacker News commenter evaluated AgentMail for their Clawdbot but chose a plain Gmail account driven by the himalaya CLI instead, reporting it has worked great. Hacker News
A skeptical Hacker News commenter argued AgentMail's founders don't understand email reputation or abuse prevention, citing Resend's use of AWS SES as evidence of how hard private-IP inbox placement is. Hacker News
An OpenClaw user whose Gmail accounts were repeatedly disabled for agent activity switched their agent's email to AgentMail and reported a far simpler API-key setup after one day of use. Reddit
An OpenClaw user names the AgentMail skill among their daily-use skills, using it to give agents email addresses for signing up to services and handling verification codes. Reddit
Show 1 more
A vendor blog's structured review praises AgentMail's API-first two-way design, funding and MCP integration but flags the missing UI, analytics, limited SDKs and manual DNS setup; its comparisons are against Gmail and transactional APIs, not Resend specifically. eesel AI
FAQ
Is Resend cheaper than AgentMail?
Modeled, not measured: moving from AgentMail Developer to Resend (free tier) saves $190 in the first year, after setup and upkeep time at $50/hour. It depends on your plan, seats and usage. the math
Can I move my AgentMail data to Resend?
Resend's community guide moves: Outbound sending code; Message history (threads, bodies, attachments); Inbound webhook consumers. It doesn't move: Conversation threading; AgentMail inbox identities on @agentmail.to (addresses are not portable); Pod-based tenant isolation (rebuild as routing logic on Resend's catch-all); Semantic search over message history. getfluxly.com
Does Resend help people switch from AgentMail?
Resend for YC Startups: current YC batch founders receive $25,000 in Resend credits valid 12 months, and YC alumni receive $15,000 in credits, plus a dedicated Slack channel with Resend's team. Not conditioned on switching from any specific vendor. resend.com
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find_alternatives({"vendor": "AgentMail"})