What type(s) of webmail apps do you offer?

Do you use any spam filters?

Is there a limit on the size of attachments I can send?

What's the maximum amount of disk space alloted to email?

My previous host lost all my email twice in the last year when they upgraded their servers. Does this ever happen on your servers?

Do you ever backup or archive the messages on email servers?

Do you send out notices of outages or upgrades to your members?