Strategies for protecting IMAP (e.g. MFA)

[Matthew Richardson]

On Sun, 14 Nov 2021 08:12:53 -0800, Michael Peddemors wrote:-

>And there are RBL's now for know IP(s) used by IMAP hackers, including 
>SpamRats RATS-AUTH that can assist in reducing those attacks.

Looking at https://www.spamrats.com/rats-auth.php the "Example Usage in
Dovecot" says "PLEASE UPDATE".

How would one use a DNSBL like this in Dovecot to reject IMAP connections
from listed IPs?

--
Best wishes,
Matthew