Zimbra - Spheron1

August 4, 2013

Bulk delete etc. failing in Zimbra 8

Shortly after upgrading to Zimbra 8, I ran into annoying behavior when trying to delete large numbers of messages, both via IMAP and the web interface. If deleting the messages one-by-one (even in quick succession), then everything was fine, but if I selected several messages and deleted them all at once then it would fail with a “UID COPY failed”...

Zimbra Comments: 0

February 5, 2012

Disabling highlighting of objects in Zimbra web UI

Zimbra has a couple of Zimlets (plugins) that highlight parts of messages when viewed in the Zimbra Web Console such as dates, phone numbers and e-mails and turn them into special contextual links. Whilst this functionality is often quite useful, sometimes you just need to see the raw, unadulterated e-mail without your client interfering with the content – particularly if...

Zimbra Comments: 0

June 27, 2011

Zimbra mailbox import/export and migration of e-mail filter rules

Zimbra has a fantastically useful built in system for exporting an entire mailbox, including the contents of the entire e-mail inbox, calendar, address book and briefcase ready to be imported on another Zimbra server either via the web interface or using zmmailbox from the command line. This makes migrating mailboxes between separate Zimbra installations incredibly easy. You can export a...

Zimbra Comment: 1

April 5, 2011

Preventing backscatter on aliased domains in Zimbra

By default, an aliased domain in Zimbra will accept all e-mail at SMTP time and then bounce a message later if it is unable to delivering it after carrying out the aliasing. This generates backscatter, which can be abused and even lead to your mail server appearing on some blacklists. Luckily, since Zimbra 5.0.12 there has been a way to...

Zimbra Comments: 0

April 11, 2010

Zimbra anti-spam improvements

The built in Zimbra anti-spam system is quite a neat bundle of Amavisd-new, SpamAssassin and ClamAV with some fancy automated ham/spam training based on messages being moved in and out of a “Junk” mailbox under each user’s account, but it lacks a few nice to have extra features. Luckily, it’s quite easy to enhance the Zimbra Amavisd and SpamAssassin with...

Zimbra Comments: 2

April 7, 2010

Detecting brute force attacks on Zimbra with zmauditswatch

Zimbra 5.0.11 introduced the zmauditswatch script which notifies a specific e-mail address of a potential brute force attack if certain conditions are met. This is disabled by default and the documentation to enable it isn’t particularly clear, so here is a quick run through: zmlocalconfig -e zimbra_swatch_notice_user=admin@domain.com zmlocalconfig -e zimbra_swatch_ipacct_threshold=10 zmlocalconfig -e zimbra_swatch_acct_threshold=15 zmlocalconfig -e zimbra_swatch_ip_threshold=20 zmlocalconfig -e zimbra_swatch_total_threshold=60 zmlocalconfig...

Zimbra Comments: 0

March 28, 2010

DomU kernel panic under Xen with R1Soft CDP agent

I ran into a weird problem on a freshly installed server today where one of the DomU virtual machines kept locking up with a kernel panic message: BUG: soft lockup – CPU#1 stuck for 10s! All of the other Xen DomU virtual machines running on the box were fine, so I was pretty sure it wasn’t a hardware bug. The...

R1Soft CDP/Red Hat and CentOS/Zimbra Comments: 0

October 19, 2009

Binding Zimbra to an IP

Zimbra is a fantastic collaboration suite, but it suffers from one major flaw; it really likes to take over your entire server! If you want to run Zimbra and your web site on the same server without moving Zimbra’s web UI to another port then you’ll have to convince it to bind to one IP address you can use the...

Zimbra Comments: 0

Category: Zimbra

Bulk delete etc. failing in Zimbra 8

Disabling highlighting of objects in Zimbra web UI

Zimbra mailbox import/export and migration of e-mail filter rules

Preventing backscatter on aliased domains in Zimbra

Zimbra anti-spam improvements

Detecting brute force attacks on Zimbra with zmauditswatch

DomU kernel panic under Xen with R1Soft CDP agent

Binding Zimbra to an IP