Warming up
Every account now comes with a free mailbox — warmed automatically, no domain to buy. See how it works
Transactional email API
Every account now comes with a free mailbox — warmed automatically, no domain to buy. See how it works
Choose Mailgun if you want a free plan that has no end date and logs that last longer; choose SendGrid if you send 50,000 to 100,000 a month and want the lower list price. On list prices as of September 2026: at 10,000 Mailgun lists lower ($15 against $19.95); at 50,000 SendGrid lists lower ($19.95 against $35); at 100,000 SendGrid lists lower ($34.95 against $90). The 500,000 row is left open because a plan at that size is not priced here. Prices are the cheapest published monthly plan that covers each volume, with overage left out.
What each one lists for the same monthly volume, from their own pricing pages.
| Emails a month | Mailgun | SendGrid | Warmerly |
|---|---|---|---|
| 10,000 | $15Basic 10k | $19.95Essentials 50k | $15Starter |
| 50,000 | $35Foundation 50k | $19.95Essentials 50k | $15Starter |
| 100,000 | $90Scale 100k | $34.95Essentials 100k | $29Growth |
| 500,000 | see vendor site | $499Pro 700k | $279Scale 500k |
List prices, monthly billing, USD: the cheapest published plan that includes that many emails, overage left out. Prices from mailgun.com and sendgrid.com as of September 2026; check their sites for current rates. Shaded cells are the cheaper of the two; Warmerly is shown for reference.
What each one does today. Warmerly is a third option for API-only app email; where it says "not yet", it means it.
| Feature | Mailgun | SendGrid | Warmerly |
|---|---|---|---|
| API shape | REST, form-encoded POST to /v3/{domain}/messages, HTTP Basic auth with your API key | REST v3 /mail/send with a personalizations array; bearer key | REST, JSON over HTTPS, bearer key, Idempotency-Key header |
| SMTP relay | Yes | Yes | Not yet (on the roadmap) |
| Delivery webhooks | Yes | Event Webhook: 2 on Essentials, 5 on Pro | Not yet. Read each email's delivery timeline from GET /emails/{id} |
| Templates | Yes, from the Foundation plan | Yes (dynamic templates) | Not yet. You send your own HTML and text |
| Dedicated IP | One included on Scale; $59/mo for each extra IP | 1 included on Pro and Premier | $29/mo on Scale plans |
| Suppression list | Bounces, complaints and unsubscribes are suppressed automatically | Yes: bounce, spam report and unsubscribe lists | Automatic on hard bounce and spam complaint, shared with Warmerly outreach |
| Free tier | 100 emails a day, with 1 day of logs | 100 a day for 60 days (a trial) | 5,000 a month (200 a day), no time limit, no card |
| Log retention | 1 day on Free and Basic, 5 on Foundation, 30 on Scale | Email activity: 3 days on Essentials, 7 on Pro | Content 30 days; the email record and its delivery events are kept |
| SDKs | Official libraries for several languages (see mailgun.com) | Official libraries for C#, Go, Java, Node.js, PHP, Python and Ruby | None. One HTTP request from any language |
| Support | See mailgun.com | See sendgrid.com | Email (support@warmerly.com), plus a 99.9% monthly uptime commitment with service credits |
Neither is right for everyone. These are the cases that decide it.
Warmerly sends through Amazon SES and keeps transactional mail apart from cold outreach. It has a free plan of 5,000 emails a month, but it is REST only today: no SMTP relay, delivery webhooks or templates yet. If an API is all you need, see how it compares on the Mailgun alternative and SendGrid alternative pages.
On list prices as of September 2026: at 10,000 Mailgun lists lower ($15 against $19.95); at 50,000 SendGrid lists lower ($19.95 against $35); at 100,000 SendGrid lists lower ($34.95 against $90). The 500,000 row is left open because a plan at that size is not priced here. Overage rates and plans larger than those compared are not included, so check each vendor's pricing page for your exact volume.
Mailgun: 100 emails a day, with 1 day of logs. SendGrid: 100 a day for 60 days (a trial).
Mailgun: Yes. SendGrid: Yes.
Mailgun: 1 day on Free and Basic, 5 on Foundation, 30 on Scale. SendGrid: Email activity: 3 days on Essentials, 7 on Pro.
Warmerly is a transactional email API that sends through Amazon SES. It lists $15 a month for 50,000 emails and a free plan of 5,000 emails a month, but it is REST only and has no SMTP relay, webhooks or templates yet. Compare it on the Mailgun alternative and SendGrid alternative pages.
Create a free account, verify a sending domain and send a test from the dashboard. 5,000 emails a month free, no card.
