roundcube install?

[zoxovsky]

/var/log/roundcube/

There is no error logs but i got mail from gmail:

Diagnostic-Code: smtp; The recipient server did not accept our requests to connect. Learn more at https://support.google.com/mail/answer/7720
[mail.domain.com. 176.31.xxx.xxx: generic::failed_precondition: connect error (0): error]

some /var/log/exim4/ :

2017-03-09 21:38:37 1cm4nW-0007dh-0Z gmail-smtp-in.l.google.com [2a00:1450:400c:c07::1b] Connection timed out

and this :

2017-03-09 21:42:45 1clU5u-0004A6-M0 mail.domain.com [176.31.xxx.xxx] Connection refused