I have OL 2010 and 2003 both giving me the same error message:
(not sure numbers and letters are the same)
552 sid:randomstring:Message rejected for spam or virus content
The appears in inbox immediately about clicking send.
One box is Vista one is XP. I have run both Avira from boot disc and Malwarebytes on both machines and they are clean. Both have different full time AV and I have ruled that out (I think) by totally disabling antivirus and email checking and still get message. I thought it was godaddy email accounts, but it happens to some other providers too.
Because of the instant response, I think it has to be an issue with OL, but why on two different versions. I disabled the add on s on the OL10 and that didn't help.
We are having to use Gmail and yahoo to work around this...