Thanks for your question! We actually had not researched this capability before your post this morning. It looks like this is a fairly common feature within our top-rated Email Marketing Services.
Some of the services that offer this ability are Constant Contact, Get Response, Benchmark, and iContact. Most just require that you add and then confirm the email addresses you intend to use in your account Settings in the interface.
MailChimp and VerticalResponse offer a similar capability where you can change the "From" sender name in every campaign, but you can't put additional addresses into your account.
I hope this answers your question. Good luck with your emailing!
- Reece, ChooseWhat Staff