Twilio SendGrid alternatives for AI agents
Prices checked 2026-10-17 on each vendor's own pages.
Short answer: For a permanent free tier, Resend (3,000 emails/month) or Mailgun (100/day); SendGrid's trial ends after 60 days. For lower entry prices, Postmark and Mailgun start at $15/month for 10,000 emails, and Resend Pro is $20 for 50,000. For agents that must receive mail, AgentMail.
For reference, Twilio SendGrid: free tier: 60-day free trial: 100 emails/day, no credit card [source, checked 2026-10-17]; entry paid: Essentials from $19.95/month; Pro from $89.95/month (dedicated IPs); Premier custom [source, checked 2026-10-17]
| Tool | Free tier | Entry paid price | Meter | MCP server | Open source | Receives email |
|---|---|---|---|---|---|---|
| Resend | Free: 3,000 emails/month, 100/day, 3 domains [source, checked 2026-10-17] | Pro $20/month: 50,000 emails, then $0.90 per 1,000; Scale $90/month: 100,000 emails [source, checked 2026-10-17] | Emails per month; overage billed per 1,000 at the plan's rate [source] | Official MCP server (MIT) [source] | not verified | not verified |
| Postmark | Developer: 100 emails/month, no overages, does not expire [source, checked 2026-10-17] | Basic $15/month: 10,000 emails, then $1.80 per 1,000; Pro $16.50 ($1.30 per 1,000); Platform $18 ($1.20 per 1,000) [source, checked 2026-10-17] | Emails per month; extra emails per 1,000 [source] | Official MCP server by ActiveCampaign (MIT) [source] | not verified | not verified |
| Mailgun | Free: 100 emails/day, 1 custom sending domain [source, checked 2026-10-17] | Basic from $15/month: 10,000 emails ($1.80 per extra 1,000); Foundation $35/month: 50,000; Scale $90/month: 100,000 [source, checked 2026-10-17] | Emails per month; extra messages per 1,000, tiered by plan [source] | Official MCP server (Apache-2.0) [source] | not verified | not verified |
| AgentMail | Free: 3 inboxes, 3,000 emails/month (100/day), 3 GB [source, checked 2026-10-17] | Developer $20/month: 10 inboxes, 10,000 emails, 10 custom domains; Startup $200/month: 150 inboxes; add-ons $2 per inbox, domain or 1,000 emails [source, checked 2026-10-17] | Inboxes, emails per month and storage; add-ons per inbox, domain or 1,000 emails [source] | MCP server (OAuth or API key) [source] | not verified | Yes: every inbox sends and receives, with threads [source] |
FAQ
Why look for a SendGrid alternative?
Common reasons: the free trial ends after 60 days, the entry plan starts at $19.95/month, or you want an official MCP server, which Resend, Postmark, Mailgun and AgentMail publish.
Which alternative is cheapest at 50,000 emails a month?
Resend Pro at $20/month includes 50,000. Mailgun Foundation is $35/month for 50,000.
Which keeps logs longest?
Postmark: 45 days by default, up to 365 days on Pro and Platform.
Head-to-head
Other alternatives pages: Twilio alternatives · Browserbase alternatives · Lemon Squeezy alternatives