User-Agent: Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040115 Here is a suggestion for Moz Mail (and prob. Thunderbird too). I often send emails to mailing lists etc. which sometimes publish my email address online (via archives etc). For reasons of privicy, I often like to customise the email address I use when posting to different lists. e.g. I own the domain mydomain.com and have a "catch all" email system such that anything@mydomain.com comes to my mailbox. Say I'm posting to the "Mozilla" mailing list, I would want my email address to be "mozilla@mydomain.com". I would want this to affect the From: field, not just the Reply-To: so that I can hide my real, personal address from the list. I doubt that this change would be too hard to implement. As an improvment however, a new email account option could allow you to enter your catchall email domain. This domain could be used to "guess" a custom From: address header to be inserted when replying to list mail by looking at the To: address (or other hidden headers) to see where the email was sent. Apologies if this has already been requested, but I think it would be a useful feature. Hopefully at least a few people will agree with me ;) Reproducible: Always Steps to Reproduce:

Some more info (sorry for not submitting this originally). Just looked into it and "X-Original-To:" would probably be a good header (in the email to which you are replying) on which to base a guessed "From:" address for the new email. If the domain name in "X-Original-To:" matches your catch all domain, automatically place a "From:" header in the compose window with that address in it. I guess there could be another option (to go with the email catchall domain option) to either show your name in this field (e.g. Colin Guthrie <email@mydomain.com>) or just to put the address in without your name (for reasons of privicy).

Most just create a dummy account, and when you send, select that account.

A dummy account would work for the most regular uses, but I make up addresses all the time to send emails to webmasters and to complain to websites that don't work in Mozilla and various other things. I usually create an email address that would allow me to track them down later should that particular address make it onto some mailing/spam list or other. I still think it's a good idea, but I guess the public will speak!! I wouldn't expect anyone to take this enhancement onboard anytime soon, but it's the kind of thing I may have a crack at myself at somepoint should I ever find any time!!

There's a plugin that does this for you. I'm trying to find it. I'll post again when I do.

I finally found it: http://www.supportware.net/mozilla/#ext3 It's called "Freeform From and FCC on Compose".

Many thank Timur. I was eagerly awaiting that second post!! It certainly does 90% of what I want.... I think I'll mail the authors and ask them if they/I can improve it such that it can have a per account setting called "Mail Domain" where you can enter the domain at which all mail comes to you e.g. bob@mydomain.tld and blah@mydomain.tld etc. all ultimately end up in a single mail box. That way the extension can maybe look at the "X-Original-To:" header in an email you are replying to and if that has a random name@your_mail_domain (e.g. mydomain.tld above) then it can automagically fill in the Send Mail From box for you. This would be 100% perfect for me! Also possibly a history of what you've typed before would be cool to. Anyways, these are more comments for the extension author not here. If anyone feels this bug should be closed then I happy for that to happen. Thanks again Timur. Col.

As workaround you could use the Multiple Identies. http://kb.mozillazine.org/index.phtml?title=Thunderbird_:_FAQs_:_Multiple_Identities Same for Mozilla Mailnews 1.8x. What you mean is something like free-editable, see Bug 87987. *** This bug has been marked as a duplicate of 87987 ***