Hi,
You can follow this wiki: https://wiki.zimbra.com/wiki/Spamming_troubleshooting

Regards,
Minh.

Hi,

Could you show the log file related to DNS Blacklist query from your Zimbra Server. For example:
#cat /var/log/zimbra.log | grep -i barracuda
How do you set up your DNS on Zimbra server?

Regards,
Minh.

Dear Randy,
It is great if you can share howto install letsencrypt and/or commercial SSL cert on Sturn server.
Many thanks and best regards,
Minh.

Hi, Do you open http service/port both on Zimbra and your firewall? For example, on zimbra proxy server I use: web proxy mode: redirect, proxy http port: 80, proxy https port: 443 Firewall is open for port 80/443. I am currently use https://github.com/VojtechMyslivec/letsencrypt-zimbra.git /opt/lets...

Hi,
What is output of this command (as zimbra user):
zmloggerhostmap
Regards,
Minh.

Hi, please refer to this wiki: https://wiki.zimbra.com/wiki/Server_sta ... rossed_out

Regards,
Minh.

Thank Barry for your good work!
Best regards,
Minh.

Hi, I think DMARC_FAIL_REJECT fired because you set up DMARC REJECT policy on DNS (internet side) and you are using split DNS setup. You can low down this score by edit /opt/zimbra/data/spamassassin/localrules/sauser.cfg as a temporary solution. score DMARC_FAIL_REJECT 2.000 score DMARC_FAIL_QUAR 2....

I just got spammed by Synacor (through Zimbra Blog). They've decided to close-source the product but they do dare to market the product like this: Security, Privacy & Data Sovereignty Zimbra 9’s dependable server infrastructure provides the security, privacy and data sovereignty Zimbra customer...

Hi,

Please refer this: https://wiki.zimbra.com/wiki/Spamming_troubleshooting
Note: If you use zimbra 8.8, the right path for postsuper is /opt/zimbra/common/sbin/postsuper

Regards,
Minh.