Whose error is this?

[Alan Harper]

I am trying to send a message and I get the following error message
(typical unhelpful PowerMail error message):

PowerMail

Unexpected error on "mail.alanharper.com"
Class='NetP', what= 100, when=2, err=0
This message contains a virus or other harmful
content

Is this message coming from PowerMail or from mail.alanharper.com?

Thanks

A