On 2021-11-14 20:26, Matthew Richardson wrote:
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?
submission inet n - y - - smtpd -o smtpd_tls_security_level=encrypt -o smtpd_sasl_auth_enable=yes -o smtpd_delay_reject=no -o { smtpd_client_restrictions = reject_rbl_client auth.spamrats.com=127.0.0.39, permit } -o { smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, reject }
openRelay, dont do it
resolved version
submission inet n - y - - smtpd -o smtpd_tls_security_level=encrypt -o smtpd_sasl_auth_enable=yes -o smtpd_delay_reject=no -o { smtpd_relay_restrictions = reject_rbl_client auth.spamrats.com=127.0.0.39, permit_mynetworks, permit_sasl_authenticated, reject }
order do matter
for dovecot use allow_nets or weekforce policy server, 3dr party, if dovecot is the submission it would imho be a winner
i still consider external service as a insecure help