If yore gonna check for IP, you should do it in pre-login so you can reject the username/password combo if the registred IP of account does not match.But guess its better to write a custom login handler for that, that also checks user's ip against database, in addition to username/password, and tells client username/password is wrong if IP is unauth.. -------- Originalmeddelande --------Från: Lefteris Tsintjelis <lefty@spes.gr> Datum: 2021-11-12 18:48 (GMT+01:00) Till: dovecot@dovecot.org Ämne: IPv4/v6 based access checking and logging Hi,I am currently using postfix/dovecot with postfix admin and I track the last login date already by using this:https://doc.dovecot.org/configuration_manual/lastlogin_plugin/Besides last login date, I would like to also implement IPv4 and IPv6 last login tracking also and if possible, IP based login checking. Is post-login scripting the best most efficient way to go?Regards,Lefteris