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.
Hunter - Find all the email addresses related to a domain
Gmvault - Backup the emails in your Gmail account.
Apollo.io - Apollo’s predictive prospecting, sales engagement, and actionable analytics help the teams to reach its full revenue potential.
imapsync - Console-based utility for migrating IMAP mailboxes.
Icypeas - This email finder has the capacity to bypass catch-alls