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The mail system mail-user@server.localdomain (expanded from user@domain.com): can’t create user output file

When trying to send email to a Dovecot user, you get the following message:

This is the mail system at host hostname.localdomain.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<user-name@hostname.localdomain> (expanded from
    <user@domain.com>): can't create user output file

The problem here is the user’s mailbox is full. If you’re using Virtualmin you might have hit the default 50MB mailbox size parameter. Increase the size of the mailbox and try again.

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