Cannot sent email

[perfectpol7]

Hi I am running a fedora 10 desktop. when i send an email using evolution the message was not sent but returns a error message:

"Error while performing operation.

DATA command failed: Error: 550 Viagra SPAM - Hi in Subject"

and the message did not have an attachment just plain words. what might have gone wrong for i have been using this for sometime without a problem. or what security measures should be in place to remove this viagra spam. Am I infected by virus on this fedora, all my updates are up to date.

[falko]

This looks as if Postfix header checks are in place on the mailserver, and Postfix seems to reject mails if they contain "Hi" in the subject. Please contact the administrator of the mailserver.

[perfectpol7]

I am not using postfix, the eveloutation setting are pointed to my ISP for downloading mails

[falko]

Then your ISP uses header checks, I guess.