Show last email login
Can you please add a column for the last login of a mail account to the mail account overview? It would help a lot to find dead mailboxes and with customer support ("i don't get any new mails" - "yep, no surprise, your last login was 2 weeks ago, is google.com also unavailable for you?") ;-)
It should not be much work with the Dovecot plugin and an extra column in the mysql mail_user table. https://wiki2.dovecot.org/Plugins/LastLogin Debian Stretch and Jessie Backports already have this plugin in their packages.
If I can help, please let me know :)