This feature is very, very much required. There are loads of Outlook 2003 clients out there, which cannot handle HTML Disclaimers. Therefore ugly Text disclaimers have to be used. The feature should allow to select html, text or no disclaimer.
Subject: Not currently possible to specify which external domains get message disclaimers
We don’t currently have any means to distinguish between which external domains should and should not trigger disclaimers. But I’ve submitted an enhancement request for this – to be considered for future releases.