OBM Alternatives

Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.

The Cyrus IMAP server differs from other IMAP server implementations in that it is generally...

The #1 email warming service to improve your deliverability by generating realistic and meaningful engagement to your emails. Easy-to-use solution to help you land in the main inbox instead of the spam folder.

Visit website paid $19.5 / Monthly (Pro)

Web-based IMAP email client

Open Source

Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft.

Blue Mind is a complete solution of company messaging, calendars and collaborative work.

Dovecot is an open source IMAP and POP3 email server for Linux/UNIX-like systems, written with...

Open Source

Kolab Groupware is a secure, scalable, reliable, flexible, full-featured collaboration suite.

A fully fledged, free email server solution, an open source project (GPL v2).

Open Source

All your E-mail, from all your accounts, in one place. Cypht is like a news reader, but for E-mail.

Open Source

Network Solutions - Original domain name registration and reservation services with variety of internet-related business offerings. Quick, dependable and reliable.

Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.

The Courier IMAP server is a fast, scalable, enterprise IMAP server that uses Maildirs.

Horde Groupware is a free, enterprise ready, browser based collaboration suite.