In Mail.app, one can set up multiple email addresses for a single account by just entering a comma-seperated list like
firstname.lastname@example.org, email@example.com. Next, when composing a message, Mail offers a dropdown to select a "From" address. And when replying†, it automatically selects the right address if it can find a match:
Nice, but I'd like to be able to change the "From" on the fly, without going into the Account Information.
Also, in previous versions of Mail one could even specify multiple Full Names for a single account:
Email Address: Arjan <firstname.lastname@example.org>, Arjan on SU <email@example.com>
But nowadays, Mail only uses the setting of Full Name, and even ignores names in the Email Address field when no value for Full Name is set at all. Hence, it would be great if I could change the Full Name on the fly as well.
I had no luck finding a plugin for Mail yet.
† When using sub-addressing aka address tags, anything that is sent to
firstname.lastname@example.org is simply delivered to
email@example.com. I'd then like to reply with the same full address, rather than just
firstname.lastname@example.org if Mail cannot find a match, without going into the Account Information first. I sometimes also want to compose a new message with a new sub-addressing-address.