Hello,
I am using roundcube 1.6.2 and configured well. It can communicate with outside and the domain. No problem with that. But in log it gives this always.
Aug 24 11:02:32 m postfix/postscreen[823047]: CONNECT from x.x.x.x]:46632 to [x.x.x.x]:25
Aug 24 11:02:32 m postfix/postscreen[823047]: PASS OLD [x.x.x.x]:46632
Aug 24 11:02:32 m postfix/postscreen[823047]: CONNECT from [x.x.x.x]:46630 to [x.x.x.x]:25
Aug 24 11:02:32 m postfix/postscreen[823047]: CONNECT from [x.x.x.x]:46628 to [x.x.x.x]:25
Aug 24 11:02:32 m postfix/submission/smtpd[842578]: connect from _gateway[x.x.x.x]
Aug 24 11:02:32 m postfix/submission/smtpd[842703]: connect from _gateway[x.x.x.x]
Aug 24 11:02:32 m postfix/submission/smtpd[842697]: connect from _gateway[x.x.x.x]
Aug 24 11:02:32 m postfix/smtpd[841795]: connect from _gateway[x.x.x.x]
Aug 24 11:02:32 m postfix/smtpd[842803]: connect from _gateway[x.x.x.x]
Aug 24 11:02:32 m postfix/submission/smtpd[842697]: lost connection after CONNECT from _gateway[x.x.x.x]
Aug 24 11:02:32 m postfix/smtpd[842669]: connect from _gateway[x.x.x.x]
Aug 24 11:02:32 m postfix/smtpd[841795]: lost connection after CONNECT from _gateway[x.x.x.x]
Aug 24 11:02:32 m postfix/smtpd[841795]: disconnect from _gateway[x.x.x.x] commands=0/0
Aug 24 11:02:32 m postfix/submission/smtpd[842697]: disconnect from _gateway[x.x.x.x] commands=0/0
Aug 24 11:02:32 m postfix/submission/smtpd[842703]: lost connection after CONNECT from _gateway[x.x.x.x]
Aug 24 11:02:32 m postfix/submission/smtpd[842703]: disconnect from _gateway[x.x.x.x] commands=0/0
Aug 24 11:02:32 m postfix/smtpd[842803]: lost connection after CONNECT from _gateway[x.x.x.x]
Aug 24 11:02:32 m postfix/smtpd[842803]: disconnect from _gateway[x.x.x.x] commands=0/0
Aug 24 11:02:32 m postfix/smtpd[842669]: lost connection after CONNECT from _gateway[x.x.x.x]
Aug 24 11:02:32 m postfix/smtpd[842669]: disconnect from _gateway[x.x.x.x] commands=0/0
Aug 24 11:02:32 m postfix/submission/smtpd[842578]: lost connection after CONNECT from _gateway[x.x.x.x]
Aug 24 11:02:32 m postfix/submission/smtpd[842578]: disconnect from _gateway[x.x.x.x] commands=0/0
and also shows and vanishes this connection error message in web view. (//)
Why is that?
As I understand you have SMTP-gateway additional to your smtp mail server.
I don't know what is it exactly. But looks like problem with your mail-servers connection schema.
May be RC try connect to gateway and not to local smtp server? many cases can be
It looks to me that the SMTP works just fine, but after the message is sent it is being saved into the Sent folder over IMAP, and this IMAP connection fails. Enabling imap_debug and smtp_debug in Roundcube will produce some logs that might help to understand what's going on.