MailShelf Pro VS GoDaddy Professional Email

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.

Clearnet - Clearnet is an email service provider where the user can set up an email account and begin sending and receiving emails.

Athena Archiver - Athena Archiver Email Archiving Solutions provide enhanced disaster recovery options by enabling automatic off-site email storage and data replication to a mirror site.

MailPlus - MailPlus is a Dutch-based email marketing solution provider.

Thexyz - Secure premium email service with mobile sync apps for calendar, contacts, tasks, notes and FISMA compliant email archiving.

Pobox - Pobox provides email forwarding, filtering, and mailboxes.