Ok, so I’ve started using Mail.app because it somewhat sanely deals fairly well with the multiple mail servers I have these days (ISI, .Mac, and OSL). One feature I’ve been longing for is the ability to have multiple From addresses for a single mail server. Since brbarret@{osl.iu.edu, cs.indiana.edu, lam-mpi.org, indiana.edu} all end up in my OSL account, it made sense that I set things up this way. So, while trolling through the Mail.app help trying to figure out how to make a mail list I found out that you can do this already!
All you have to do is put a comma separated list of from addresses in the “address” field for an account, and you are good to go. Amazing. Why didn’t I read the help months ago. This was always my major complaint with Jaguar’s Mail.app.