I make heavy use of Claws Mail's useful address tab-completion in to/cc text boxes, and fear that I'll erroneously send to an unintended address. Erroneously sending to addressees within my company wouldn't be too problematic, but sending externally i.e. to a public mailing list / customer, etc. could be quite embarrassing, despite using GPG for truly private mail. For this reason I'd love to have the ability to have the to/cc addressee fields colour-highlighted, based on whether the addressee's domain matches a user-defined filter.
Forgot that I'd already raised this - marking as duplicate. Sorry for the noise. *** This bug has been marked as a duplicate of bug 4012 ***