Further, all rsync.net employees use pine for all rsync.net email. One interesting side-effect of this is that employee to employee emails are simply a local copy operation - they never traverse a network.
If you're looking into a mailtool that can run in the terminal (like this, or like mutt or (al)pine) I encourage you to consider running that mailtool on the actual machine with your mailspool. It allows your email to show up in your INBOX immediately and, as described above, allows for email interactions that don't leave the server ...
Months after i started using it, someone suggested i try mutt. I'm definitely going to, but i haven't got round to it yet.
What is the problem with Mutt though? Does Aerc have color or themeing support? Does it have a seperate daemon to talk the email protocols such as IMAP4?