One of our customers is experiencing what appears to be a weird bug in Virtualmin 3.36. If he tries to set any of his users' mailbox quotas above 30 MB, it "maxes out" at 30 MB. The command does not generate an error, but it will not allow the quota to be set any higher. The overall quota on his virtual server is 400 MB, so I don't know where the 30 MB limitation is coming from.
I am able to replicate the problem by switching to his account and trying to increase one of his user quotas to 40 MB. According to the Webmin Actions Log, the edquota command is being issued, but the log does not display the values. However, the webmin.log file clearly indicates the following:
hardmquota=''
hardquota='30000'
quota='30000'
softmquota=''
softquota='30000'
Since the quota was entered as 40 MB on the form, somehow Virtualmin is over-riding it as 30 MB when submitting the change.