Persona works fine for me except in envelope...
Explaination : My account is email@example.com. I can chose one of my differents adresses to send email (i.e. firstname.lastname@example.org). Headers of this email are correct (my friends can see From: email@example.com).
BUT envelope is wrong, MAIL FROM: firstname.lastname@example.org
It should be MAIL FROM: email@example.com
Feb 8 23:17:20 hostname postfix/qmgr: 021A39C310: from=<firstname.lastname@example.org>, size=862, nrcpt=1 (queue active)
Maybe I have not found the correct setting or is it a bug ?