RoundCube does not see incoming mail

Question

Email

Good afternoon. I use the ISPmanager panel, instead of the standard sendmail and squrrielmail I installed postfix and roundcubemail. Through the new webmuzzle, mail leaves without problems. But there is no incoming mail. At the beginning, all mail was stored in /var/spool/mail, then I tweaked postfix and procmail. Now mail is forwarded to /var/www/username/data/email/domain.tld/user/ and 3 folders are created here: cur, new and tmp. Mail is forwarded to new and that's it. How to make mail appear in RoundCube?

Answer 1

All problem solved!!! Wrong procmail rule was in /etc/postfix/main.cf
Was
mailbox_command = /usr/bin/procmail -a "$EXTENSION" DEFAULT=$HOME/
became
mailbox_command = /usr/bin/procmail -a "$EXTENSION" DEFAULT =$HOME/.maildir/
everything is fine now!

Answer 2

And if you manually connect via IMAP / POP, you can see the mail?

Answer 3

If it is not visible manually on IMAP either, then it is obvious that the problem is not in RoundCube, but in the IMAP server, and you need to look there.
The initial message doesn't say which IMAP server is being used, but I would start by checking that it actually supports Maildir (that's when cur/new/tmp). If so, make sure it looks for mail in the correct directory in /var/www/username/data/email/domain.tld/user/