Mailgun Sending Limits 2026: Free Plan and Rates

What happens when you exceed the limit

Requests rejected once the daily allowance is used. Sending services enforce their quotas at the API, so the failure is explicit and immediate. The reputation of the domain you send from is a separate matter that the quota does not protect.

How the limit interacts with a warmup ramp

A warmup ramp and a provider cap are two different ceilings. The cap is where Mailgun stops you; the ramp is where reputation would stop you first. MailStrike's default ramp climbs to 30 warming emails a day per mailbox over 21 days, and real outreach starts at 20 to 30 a day once the ramp is done. Set the provider, the domain's age and the target volume below to see the schedule.

Warming a day, per mailboxMailStrike's guidance

Outreach a day, per mailbox	1 mailbox	2 mailboxes	3 or more
Not sending yet	30	21	18
10 emails	30	21	18
20 emails	25	18	15
30 emails	20	14	12
40 emails	15	11	9
50 emails	10	7	6

The rule behind the table: a mailbox on its own that is not sending yet warms at the plan default of 30 a day, and once outreach starts it drops one warming email for every two you send, down to a floor of 10. Put a second mailbox on the domain and each one needs 70% of that figure, three or more and each needs 60%, because the domain earns the signal across all of them. Volume is a setting per mailbox, so you can dial these in directly.

Mailgun is a sending service, not a mailbox. Its IP warm-up (where it offers one) ramps a dedicated IP's volume; it does not build the sender reputation of the domain you send from. Warm the domain's mailboxes with MailStrike, then send campaigns through Mailgun: see how warming works.

Trial, free tier and new-account restrictions

100/day. Free and trial tiers exist to test integration, not to run campaigns; the volume above them is a plan decision.

The bulk sender rules are a separate limit

None of the caps above is the line that decides placement. Google's and Yahoo's bulk-sender requirements and Microsoft's 2025 high-volume rules set authentication, spam-rate and unsubscribe conditions that apply well below any sending cap; the sender requirements page has them provider by provider, and the auth checker tests a domain against them.

How Mailgun compares

documented cap per day (log scale); basis differs per provider

Each bar is the provider's own published figure and its basis: Microsoft 365 (recipients per mailbox per day), Outlook.com (recipients per day), Google Workspace (messages per user per day), iCloud Mail (messages per day), Gmail (messages per day), Brevo (emails per day on the free plan), Amazon SES (messages per day in the sandbox), SendGrid (emails per day on the trial), Mailgun (messages per day on the free plan). Zoho Mail, Yahoo Mail, Postmark publish no fixed daily cap. Checked on 6 Sep 2026.

Questions about Mailgun sending limits

What is the Mailgun sending limit per day?

Free plan 100 messages/day, 1 domain. Recipients per day: plan-based. Source: Mailgun's own documentation, checked 6 Sep 2026.

What happens when you exceed the Mailgun sending limit?

Requests rejected once the daily allowance is used. Above the plan's allowance, sending resumes when the quota or plan allows.

How many recipients per message does Mailgun allow?

1,000 per API call.

How do I increase the Mailgun sending limit?

100/day. Volume above that is plan-based: Free plan 100 messages/day, 1 domain.

Is there a Mailgun rate limit per minute or per hour?

plan-based.

Mailgun sending limits (2026)