users in the other office can send but can't receive emails, i used telnet to connect to their server and also used ehlo command to send a test mail but as soon as i insert "mail from:email@example.com" and hit Enter i get error: "452 Insufficient system storage"
c:\ has 4GB free
d:\ has 60GB free
i dont understand why this insufficient storage error showed up
your help is very much appreciated