Message Disclaimers - Exceptions?

Message disclaimers are setup to append to the bottom of messages leaving the domain. Is there a way to create exceptions to the rule? So message to the external domains @abc.com and @abcd.com would not have the disclaimer text added? We have a notification service that can send messages to the text email address of a cell phone, ie) @txt.att.com or @vztext.com. However when the disclaimer is appended it’s way over the 160 character limit causing multiple text messages. It would be nice to exclude these domains from the disclaimer rule.