I don't know what I need to change to allow this, but I can't seem to send a post to a newsgroup with an attachment. I get the following error.

Outlook Express could not post your message. Subject 'Is this a font? Anyone got one close to it ?', Account: 'newsgroups.bellsouth.net', Server: 'newsgroups.bellsouth.net', Protocol: NNTP, Server Response: '441 Posting Failed (Rejected by POST filter)', Port: 119, Secure(SSL): No, Server Error: 441, Error Number: 0x800CCCA9


This occurrs with Outlook Express and Outlook 2000. I can send an email with an attachment. I can receive emails with attachments. I can receive newsgroups with attachments. But I cannot send with an attachment. What am I doing wrong ?