User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; de; rv:1.8) Gecko/20051111 Firefox/1.5 Build Identifier: Version 1.5 (20051025) I create a User account as Name: Dürr, Sören eMail: Soeren.Duerr@domain.com I send an email to myself. In my send items as well as my inbox i see From: Sören <Soeren.Duerr@domain.com> When I hit reply, the email is supposed to be sent to the above and also do Duerr So the "," in the From address is treated as a separator character even though it is encoded in ISO-8859-1 as =2C Reproducible: Always Steps to Reproduce: see above This is super-annoying in German language environments where last, first is a common form of the firendly name.

Duplicate of bug 310547 and/or Core bug 254519?

Yes, a dupe. *** This bug has been marked as a duplicate of 254519 ***