You log onto the web interface on Zimbra web interface and you get the following dialog By default Zimbra uses DoSFilter Throttling Mechanism to avoid large number of request over a short period of time. So if the Zimbra server … Continue reading →
Tested on Zimbra 8.7.7 You find the following in the /opt/zimbra/log/freshclam.log ClamAV update process started at Mon May 15 09:27:11 2017 main.cvd is up to date (version: 57, sigs: 4218790, f-level: 60, builder: amishhammer) WARNING: getpatch: Can’t download daily-23387.cdiff from … Continue reading →
If you get this message there is a good chance the GalSync account for the domain has been deleted. To correct this issue, you need to ssh to the zimbra server (or if you are running zimbra on multiple servers … Continue reading →
A user with an iPhone sends and email with an attachment to a recipient on a Zimbra server. The email is rejected and the following entry is made in the log: Mar 8 16:08:41 mx2 postfix/cleanup[20141]: 654AD251CD: reject: header Content-Type: … Continue reading →
Enabling LDAPS at installation time To enable LDAPS at installation time, change the port used by the LDAP server in the installation menu from 389 to 636. Enabling LDAPS after installation Modify the URL used by LDAP on all servers, … Continue reading →
Edit /opt/zimbra/maps/postfix_black_white_list Add the following entries # a comment 5.5.5.5 REJECT Stop sending me spam 4.4.4.0/24 REJECT All your servers are compromised fubar.com REJECT I want no email from anyone@fubar.com .fubar.com REJECT I dont want email from your subdomains either … Continue reading →
There are a couple of customizations that can only be done by editting the /opt/zimbra/postfix/conf/main.cf file. The problem is, if you do any upgrades, you loose your changes. After being burned by this, I added this script to my servers … Continue reading →
By default, emails with an encrypted PDF or archive (i.e. zip) attachment will be blocked by Zimbra’s antivirus program, ClamAV. The user will be notified by an email titled ‘VIRUS (Heuristics.Encrypted.PDF) in mail FROM….’ with a message containing ‘A virus … Continue reading →