Export a user's email to a file (pst?)
delete message after x number of days on pop3 client
Manual collection of email from ISP?
and 2 more ...
Force outgoing email to local domain out to SMTP service
Cannot start VPOP3 Service
Ability to search whitelist and blacklist addresses
LetsEncrypt SSL Certs
Be able to release messages from quarantine by email
Response issue - No autoresponse when original sender was from an external address.