If previously disk quotas were disabled on a Directadmin server at the system level, i.e. partitions were mounted without quotas. And once you enabled disk quotas you need to ensure an upper disk usage limits are enforced.
It is possible to use directadmin without installing/using POP3/IMAP servers. It's Dovecot which adds support of POP3/IMAP on a Directadmin server. And here you can learn how to completely remove Dovecot from a Directadmin powered server.
There are some ready tools to manage MySQL dumps in a console on Directadmin server. And here we'd like to say a couple of words about most useful of them.
Whatever the reason might it be, if you decided to remove ClamAV previously installed by CustomBuild script on a Directadmin server here is a guide on how you can do it.
I use nginx+apache and awstats shows too low values of used bandwidth, and in directadmin I see the bandwidth is much higher than in Awstats. What is wrong here?
If you want to set roundcube as the default webmail client on a server with Directadmin here is a guide on how to achieve the desired.
Should you need a custom version of NGINX or any other software on directadmin powered server with custombuild 2.x, here you can see a working solution.
By default dovecot if mailbox quota is exceeded drops a 552 error which would mean that exim declines the message without further retry to deliver it: Requested mail action aborted: exceeded storage allocation.
Should you happen to see lines warning about "unauthorized connection from server.domain.com [11.22.33.xx]:56450 to port 783, fd 6 at /usr/bin/spamd line 1603" here is a possible solution.
If you want remove Exim version number on a Directadmin server, then here is a guide for you.