IPv4/v6 based access checking and logging

[Lefteris Tsintjelis]

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