Hello,

you can check your mail server here :
https://www.mail-tester.com/

Regards,

Hello

what you see is the OS DKIM package, not Zimbra DKIM.
To be sure, as Zimbra use the following command to see if Zimbra DKIM is running :
zmopendkimctl status

Regards,

Hello,

if you get a connection timed out inside the webmail, you should check if Zimbra Postfix is running or its if Zimbra Postfix port is reachable.

Regards,

Hello,

related to the log you provided, it is a problem of memory :

Jul 30 11:51:30 mail clamd[30211]: daemonize() failed: Cannot allocate memory

Regards,

Yes I think it is normal. In conversation view you have in the same folder when you expand the conversation the mail the user sent and the mail the user received. If user A sent mail to a distribution is belonged to, so he should have the mail he have sent and the mail he have received. Only the ico...

Hello,

What you get is normal behavior. If you do not want to see it change your the sorting view from conversation to mail.
You set it by folder mail.

Regards,

Hello

just do that :

Without plus, it should replace all configurations related to this attribute (do not forget to backup the other entries for this attribute).

Regards,

To get more information :
1 - check the account configuration with command line.
2 - track a mail which should be forwarded.

Regards,

Hello,

check the crontab Zimbra, it delete log than more 8 days.

Regards,

Hello,

upgrade to 8.8.15 which is a LTS and check again.
Regards,