Bounces and auto-pause.

A bounce is an email that couldn’t be delivered.

Hard bounces

The address doesn’t exist. For example “mailbox does not exist”.

• The address is blocked across your whole account at once.
• It is never emailed again, from any campaign.

Soft bounces

A temporary problem. For example a full mailbox.

• We retry 3 times over 72 hours.
• If it still fails, it counts as a hard bounce.
• You can block a soft bounce yourself from the domain page.

Auto-pause

Each campaign has a bounce limit. The default is 5%. When the bounce rate reaches it, the campaign pauses itself. 2–3% protects your mailboxes better.

When a campaign pauses:

1. Check your list. Remove old or bought contacts.
2. Check your domain’s SPF, DKIM and DMARC.
3. Then click Resume.

See every bounce

Open Mailboxes, then a domain. You see the daily bounce rate and every bounced email, with the code and reason from the receiving server.

Keep bounces low

• Import from fresh, trusted lists.
• Let us check contacts on import. See How we check contacts.