NikaMail Alternatives

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

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

Open Source

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.

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

Open Source

Sendmail is a general purpose internetwork email routing facility that supports many kinds of...

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

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

Open Source

PowerMTA is an industrial-strength software for high-volume email delivery.

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

Open Source free

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

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

Configure SMTP e-mail in IIS when you want to deliver e-mail messages from your site.

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.

Open Source

Full featured email server built in docker with free plan.