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Modoboa is a mail hosting and management platform including a modern and simplified Web User Interface.

We make the send button safer. For every campaign, every message, and every inbox, Email on Acid has the time-saving tools you need to put your best email forward.

paid Free Trial $73.0 / Monthly (With a year subscription)

B2B SaaS: Make your app enterprise-ready! Authentication - SAML/OIDC SSO, Directory Sync (SCIM 2.0), Audit Logs, Data Privacy Vault, and more!

Try for free Open Source free $49.0 / Monthly (Per connection)

Cloud email security & anti-spam solution

Fortify your email server setup with ClrStream

paid Free Trial $1.0 / Monthly (1 user )

Libraesva Email Security Gateway provides enterprise email protection to assist small to large-sized businesses and enterprises to prevent outside attacks on their network.

Protect your PC with 100% Signatureless Anti-Ransomware AppCheck

DirectSuggest connects decision-makers directly to employees, making it simple for an employee to make suggestions on any device with the assurance they arrive where needed.

paid Free Trial

Warm up your cold email inbox, and never land in spam anymore!

Try for free freemium $9.0 / Monthly

LuxSci providing HIPAA-compliant email, secure email & web services.

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

A very good alternative for Windows Server, for free

Save time by adding powerful spam filtering to the e-mail client on your Mac.

OpenChange aims to provide a portable Open Source implementation of Microsoft Exchange Server and...