Re: Blocking with RBLs

On 09/01/2026 12:08 EET Lefteris Tsintjelis via dovecot <dovecot@dovecot.org> wrote:

Hi,

Is there a way to block with RBLs? I already have a really good and very trustworthy and accurate internal one that works extremely well and fast with my SMTP servers for years now. Is there a way to apply the same RBL to dovecot? Logs are really going crazy as they stopped with SMTP and started with IMAP for a while now since dovecot is wide open to these attacks. Anvil does not seem to do much here. I am looking for solutions other than fail2ban or anything similar to this.

Lefteris

You can use auth_policy_server settings to configure an external service for this, please see e.g. https://github.com/PowerDNS/weakforced/ as an example of such service.

Aki