Since DirectAdmin works with ‘per e-mail account send limits’ some things can work out pretty annoying.
In this case the customer sent 1000 e-mails (not SPAM) and want to send e-mail number 1001. But, changing the limit to 2000 will result in a
Please set a limit between 1 and 1000
Despite the fact of the “Zero is unlimited”, if you enter 0 it will give:
You cannot set an unlimited send limit
So I ended up to search in the files and remove the usage by hand:
rm -f /etc/virtual/domain.com/usage/info
Now the usage is removed and the customer is able to send another 1000 e-mails. Which still is not solved but for now it’s done.