I have some issues to make my mailserver work and i think it's due to my wrong user creation. I took your template and pasted in a new file accounts.cf under ./postfix and filled my data in there. somehow like this:

imap

username: [email protected]
password:
server: <123.132.123.123>
imap port: 993
imap path prefix: INBOX
auth method: md5 challenge-response

smtp

smtp port: 587
username: [email protected]
password:
auth method: md5 challenge-response

or is it supposed to be:

imap

username: [email protected]
password: mypassword
server: 123.132.123.123
imap port: 993
imap path prefix: INBOX
auth method: md5 challenge-response

smtp

smtp port: 587
username: [email protected]
password: mypassword
auth method: md5 challenge-response

either way, i cant connect a client to the server and when i send an e-mail to it, nothing is saved under /var/mail (also did postfix reload)
i could access the ports with telnet so i'm pretty shure something is wrong with the server-setup