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This is very good topic. Polarismail and Rackspace are 2 best services at all. Rackspace is better, but cost more, minimum 10$. The best part of Rackspace (compared with Polarismail):
1) envelope-from (SMTP MAIL FROM) is always the same as mailbox main address. This allows to set any From address and SPF is still correct, because you have SPF record in your nameserver, in your domain, to allow Rackspace sending mails out.......Polarismail sets envelope-from the same as you set into From. And this means SPF dont fit anymore.
2) DKIM ready. Polarismail is not.
3) Migration tool that works also as one directional synchronization.
Polarismail font is little better but this dont mean Rackspace is ugly. Polarismail have folder sharing, Rackspace dont. Polarismail have possibility to include external IMAP mailboxes as additional folders in mailbox. Altough you can copy mails between those mailboxes, the mails date dont preserver and its not good idea for copy.
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