Hey,

yesterday i've installed a new mailserver instance on a debian8 machine (postfix, dovecot, nginx (with php5-fpm, mysql). I've also setup a roundcube 1.2, and here i got a problem, when i login into the mailbox in roundcube, the inbox folder is empty (others too) and when i'm trying to send an E-Mail from roundcube, the sending popup appears but no mail is going out and it hungs at this position... RC-Error Log is not showing any errors, roundcube smtp log is not going to be created (yes debug modus is set in config) and the /var/mail.log is only documenting the imap login:

Jul 20 09:21:29 vc1 dovecot: imap-login: Login: user=admin@vc1.brainfact.de, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=30866, secured Jul 20 09:21:29 vc1 dovecot: imap(admin@vc1.brainfact.de): Logged out in=70 out=695

There are also no errors in nginx or php5-log....

In Thunderbird the inbox mails are shown and sending also works fine. The RC installer can also send e-mails... (via localhost smtp and tls also)

Do you have any advice how to solve or troubleshoot this problem?

best regards Eric