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When you verify a custom domain, it enters a warmup period before reaching full sending capacity. This protects your domain’s email reputation by gradually establishing a sending history with mail providers.

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Warmup period

After DNS verification passes, your domain moves to pending_warmup status. The warmup period lasts 72 hours by default. Once the warmup window expires, the domain automatically transitions to active. During warmup you can still send email — at a reduced daily limit.

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Send limits by status

Domain statusDaily send limit
pending_dnsCannot send
pending_warmup10 emails / day
active50 emails / day
suspendedCannot send
Daily send counters reset automatically at midnight. The system tracks the date of the last send; when the date changes, the counter resets to zero before the next message goes out.
If you attempt to send beyond your daily quota, the request is rejected with an error. The counter resets at midnight and sending resumes normally.

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Bounce rate tracking

AgentPost tracks delivery and bounce events for each domain in real time. These counters are visible on the domain detail page in Settings:
  • Deliveries — successful email deliveries in the current tracking period
  • Bounces — messages that bounced in the current tracking period
  • Bounce rate — percentage of bounced messages out of all delivery attempts
Both counters reset daily.

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Auto-suspension threshold

Your domain is automatically suspended when both conditions are met:
  1. Bounce rate exceeds 10%
  2. At least 5 total events (bounces + deliveries) have occurred
The minimum event count prevents a single early bounce from triggering a false suspension.

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If your domain is suspended

A suspended domain cannot send email. To investigate and recover:
1

Check the suspension reason

Go to Settings → Domains and open the suspended domain. The domain detail page shows the suspended_reason if one was recorded.
2

Review your recipient list

A high bounce rate usually means you are sending to invalid or outdated addresses. Clean your list before attempting to resume.
3

Contact support

If you believe the suspension was triggered in error, reach out to AgentPost support. Manual review and reinstatement is handled on a case-by-case basis.
Continuing to send to addresses that bounce damages your domain’s sending reputation with mail providers. Resolve the root cause before requesting reinstatement.

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Domain status lifecycle

pending_dns → pending_warmup → active
                                  ↓
                              suspended
A domain can move to suspended from any sendable state — either automatically (bounce rate threshold) or manually by AgentPost.