MesQuilla

I looked at the code a little to see if this might be possible at all.  It might be. The message header has an "accountKey" string property, and the code that gets the identity in compose  seems to use that in getting the identity. But I would need to do a little coding and test to be sure.

But that is not something that FiltaQuilla is capable of doing at the moment. I would need to add a custom action to set the identity, or at least something generic to allow you to execute some javascript as a custom action. At least the latter is a high priority for my next release, then it would be failry easy for people to do simple experiments.

If you are a coder and would like to experiment, the filter action appendToSubject is an example very simple custom action that simply modifies the message header in the database. You could do the same thing to modify the identity. A fancier application would need XBL code written to translate in the UI from the accountKey to whatever is the normal display of the account name in a dropdown list. That is considerably trickier.

If I look in my request database, I have the following item which I think is what you want:

"From Mozilla bug 264770:

Email identities are a great feature, but without the ability to automaticallyuse them, they're not very useful.  Eudora handles this simply with a messagefilter feature - "set personality".  The personality (same as identity) is setwith an extended header, and when I reply to an email, Eudora knows which of mydozen-plus email addresses to use, and which one of my associated signaturefiles to use."

Anyway, I've got this request in my database, but I can't make any promises on if and when I will get to this. Sorry it does not meet your needs today.

rkent