Cyrus

Syntax used in this document includes the following.

• example.com - a domain name
• username - a username or local part of an email address
• cyradm> - a cyradm prompt (already authenticated as an admin user)
• cyrus$ - shell prompt for the cyrus user (in some cases you can also do the command using su cyrus -c "..." but be careful to correctly escape characters)
• root# - shell prompt for the root user

The example commands given are for installations where the imapd.conf has the following options (among others)

admins: cyrusadmin
defaultdomain: cyrusdomain
allowusermoves: on

deletedprefix: DELETED
delete_mode: delayed
expunge_mode: delayed

unixhierarchysep: on
virtdomains: userid

hashimapspool: true
fulldirhash: on

Listing and fixing mailbox quotas (both use and limit)

Check mailbox quota use for the domain example.com

cyrus$ /usr/lib/cyrus-imapd/quota -d example.com

To check and fix the mailbox quota use for the domain example.com

cyrus$ /usr/lib/cyrus-imapd/quota -d example.com -f

If a mailbox quota is incorrect on the mailstore it can be changed from cyradm. The below example sets the quota to 40MB (the number is the mailbox quota in KB)

cyradm> setquota user/username@example.com 40960

To view the current quota for a mailbox

cyradm> listquota user/username@example.com

Error: can't fork process to run service Resource temporarily unavailable

This is when the number of files/processes that cyrus is using has exceeded the ulimit variables.

To fix, add the following into /etc/security/limits.d/90-nproc.conf

cyrus      soft    nproc     unlimited
cyrus      hard    nproc     unlimited
cyrus      soft    nofile    30000
cyrus      hard    nofile    30000

And then reboot the server (can we just do this instead? service cyrus-imapd stop ; service cyrus-imapd start)