I have several email accounts configured. I subscribe to a user group that sends me emails when someone posts to the group. This email is sent to my "default" email address, but when I reply, it chooses another account instead. In fact sometimes I briefly see the right address in the From field, but it is quickly overwritten with the "wrong" address. Most of the time, though, this is hard to see, so it appears that the wrong address is selected immediately. Replies to other emails seem to work OK. It's just emails from this user group. I suspect it has something to do with how the user group addresses its emails. Here's selected lines from the header of one of those emails: To: "<name> <hidden>@comcast.net [homevision-users]" <homevision-users@yahoogroups.com> From: "'<name2>' <hidden>.com [homevision-users]" <homevision-users@yahoogroups.com> Sender: homevision-users@yahoogroups.com Mailing-List: list homevision-users@yahoogroups.com; contact homevision-users-owner@yahoogroups.com Delivered-To: mailing list homevision-users@yahoogroups.com Reply-To: homevision-users@yahoogroups.com I'm suspecting that the the To: field having the user group name in it confuses Thunderbird. I would think that if Thunderbird can't match the To: address, it should use the default. Why it selects my "second" email account for the reply address instead of the default seems like a bug. BTW, the default is the same as the address in the To: field - <name>.comcast.net Any way to fix this?