Proofpoint - Proofpoint provides cloud-based email security, e-discovery and compliance solutions for companies to protect sensitive business data.

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.

Hornetsecurity - Hornetsecurity offers you comprehensive, integrated managed e-mail security services.

Gmvault - Backup the emails in your Gmail account.

Symantec Email Security.cloud - Symantec Email Security.cloud provides always-on, inbound and outbound email security against malware, targeted attacks, and advanced threats

imapsync - Console-based utility for migrating IMAP mailboxes.