Why did my ESP block the send?

ESPs block sends to known bad addresses to protect their shared IP reputation and your domain reputation.

Can I bypass the suppression list?

In AWS SES, you can remove an address from your account-level suppression list if you know the user has fixed their inbox. However, do this sparingly.

← Error library

Suppression List Bounce Blocked by ESP

permanent Concept

Meaning

Your Email Service Provider (ESP) blocked the email from being sent because the recipient address is on their internal suppression list due to a previous hard bounce or complaint.

Common causes

The email address previously hard bounced.
The recipient previously marked your email as spam.
The address is on a global suppression list maintained by your ESP (e.g., Amazon SES Global Suppression List).

How to fix

Do not attempt to send to this address. The ESP is protecting your sender reputation by blocking it.
If you are certain the address is now valid, you may be able to manually remove it from your account-level suppression list (depending on the ESP).

Provider notes

Amazon SES. SES automatically adds hard bounces and complaints to your account-level suppression list. If you send to an address on this list, SES immediately returns a 'Permanent Suppressed' bounce without attempting delivery.

Example bounce

Permanent Suppressed: Amazon SES has suppressed sending to this address because it has a recent history of bouncing as an invalid address.

FAQ

Why did my ESP block the send?: ESPs block sends to known bad addresses to protect their shared IP reputation and your domain reputation.
Can I bypass the suppression list?: In AWS SES, you can remove an address from your account-level suppression list if you know the user has fixed their inbox. However, do this sparingly.