Documentation
The address is on a suppression list.
The message was not attempted at all, because this address bounced or complained before.
What it means
A suppression list stops you from sending to addresses that have already hard-bounced or complained. Mailtruss keeps one for your organization, and the delivery network keeps its own. When an address is on either, the send is refused before it reaches the receiving server, so there is no SMTP code to read.
Typical codes and wording
no code: the message was not attempted
Common causes
- The address hard-bounced earlier (it did not exist, or the receiver blocked you).
- The recipient reported a message as spam: complaints are kept permanently.
- The recipient unsubscribed: unsubscribes are kept permanently.
- The address is on the delivery network's own list because of an earlier problem elsewhere.
What to do
- Open Suppressions in the dashboard and look the address up. The reason and the date are shown.
- For a bounce, confirm the address is correct and the recipient wants your mail before you remove it.
- Do not remove complaints or unsubscribes. They are permanent on purpose: mailing someone who said no makes the next complaint more likely.
- If a bounce was caused by a problem you have since fixed (for example, an unverified domain), removing the address and sending again is reasonable.
What Mailtruss shows
Titled "Address is on the delivery network's suppression list" when the delivery network's list stopped the send. For an address on your own list, later sends to it are skipped, and the Suppressions page shows the reason and the date.
Is it safe to retry?
No. Confirm the address first.