Cakemail - Email marketing and transactional emails that deliver. Try it for FREE!
Cryoserver - Cryoserver is an all-in-one email archiving solution that empowers you to preserve your email in a tamper-evident archive, making you transform your data into a useful archive for everyday use.
Hatchbuck - SMB sales and marketing software
Gmvault - Backup the emails in your Gmail account.
Salesfusion - Salesfusion provides an easy to use marketing automation platform that allows sales and marketing teams to be successful.
imapsync - Console-based utility for migrating IMAP mailboxes.