Automatic message in spamcheck mails

I hope i'am right here, searchin google since hours but can't find.
I want an automatic signature to all mails going throuh my mailgate (manged via ispconfig 3, great tool) which are scanned by amavis/clamav.
Some thing like

"This mail is scanned bay amavis/clamav against and thought to be virus free"

Any hints, links, howto's would be appreciated.

Thanks

Rainer

 

$X_HEADER_LINE = "what ever you want";

 

May be I'm blind

I went through alls of tehe pages an the suggested link, about 10 but die not found any solution or that problem. Do you have the exact title.

Thank you

Rainer