https://forum.howtoforge.com/threads/howto-login-imap-pop-by-email-address.13526/
Howto login IMAP/POP by email address ? | Howtoforge - Linux Howtos and Tutorials
Hello, Is it possible to login on IMAP or POP service by email address (in place of username) ? With RoundCube package for ISPConfig, it's ok !...
login imapby email