Email problem

[tap.queen]

I am having trouble sending email. All of my messages are giving errors:

An unknown error has occurred. Subject 'Photographers', Account: 'MAIN', Server: 'mail.academyarts.net', Protocol: SMTP, Server Response: '550 Administrative prohibition', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC69

I seem to be GETTING all of my email, but just not able to send.

[Katmai512]

HELP!!! I'm having the same problem!

Thing is, if I change from one program to another, it sometimes work (Thunderbird to Outlook to Outlook Express, etc), only to come back again after a while. What's wrong with this?

My exact error is (0x800CCC69) '550 Administrative Prohibition'

I've already tried changing the port from 25 to 26 and it worked for a while, now its back again :confused: Our other emails here in the office seem to be working fine though...

Appreciate technical support's assistance!