Sendmail Alternatives & Competitors

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

Key Postfix features:

Security Performance Compatibility Reliability

Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.

Key Exim features:

Highly Configurable Flexible Routing Active Community Support Efficient Transport Mechanism

Open Source

Email that sounds like you, and gets measurably more like you every week. Drafts in Gmail, Outlook, and the browser. Free to start.

Key ForthWrite features:

Voice Matching Auto-draft replies Batch-drafting Works in browser

Try for free freemium $12.0 / Monthly (Standard plan)

sSMTP is a simple MTA to deliver mail from a computer to a mail server.

Key sSMTP features:

Lightweight Easy Configuration Secure Email Sending Simplified Use Case

KumoMTA is the world's first Open-Source MTA designed from the ground-up for large-volume senders. Get a fast, flexible, supported solution.

Key KumoMTA features:

Performance Config As Code Policy Engine DKIM

Open Source free

MailerQ is a high performance Mail Transfer Agent (MTA) designed for delivering large volume email messages at very high speeds.

Key MailerQ features:

High Performance Flexible Configuration Scalability Real-time Monitoring

OpenSMTPD is a FREE implementation of the server-side SMTP protocol as defined by RFC 5321, with...

Key OpenSMTPD features:

Simplicity Security-focused Lightweight Integration with OpenBSD

Open Source

Mail-in-a-Box provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software and also includes contacts and calendar synchronization.

Key Mail-in-a-box features:

Ease of Setup Full Control Cost-effective Open Source

Open Source

The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open...

Key Courier-MTA features:

Modular Architecture High Performance Open Source LDAP Support

Open Source

Scriptable and scalable SMTP server and email framework designed for service providers.

Mutt is a small but very powerful text-based mail client for Unix operating systems. .

Key Mutt features:

Lightweight Highly Configurable Fast Secure

CheFSendeR is a simple command line tool to send emails.

Key CheFSender features:

User-Friendly Interface Automation Features Integration Customer Support

free

Alpine is a fast, easy to use email client that is suitable for both the inexperienced email user...

Key Alpine features:

Lightweight Security-focused Package Management Docker Compatibility

NeoMutt is a command-line mail reader. It's a version of https://alternativeto.

Key NeoMutt features:

Customization Advanced Features Open Source Terminal-based

Open Source