nullmailer is a simple relay-only mail transport agent.
Pros
- Easy to set up and configure
- Low resource usage
Cons
- Limited to relaying mail only
- Less features than full mail servers
Best sSMTP Alternatives ranked by AI · updated May 2025
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sSMTP is a simple and secure program for sending outgoing email from a computer to a mailhub.
Price: Free
🎯 github.com/ajwans/sSMTP
Top 6 sSMTP alternatives
msmtp is a simple and efficient mail transfer agent with support for various authentication methods and encryption. It is a reliable solution...
Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.
Postfix is an open-source mail-transfer agent used to send, receive, and relay email on Unix-like systems. It is designed for secure, reliable...
Pros
- More widely deployed and documented than Haraka
- Strong security defaults and operational stability
- Broad integration with Linux mail-hosting tools
Cons
- Less flexible for JavaScript-based custom workflows than Haraka
- Configuration syntax can be complex for advanced setups
- Not a complete mailbox or webmail platform by itself
Free, open source
Sendmail is a general purpose internetwork email routing facility that supports many kinds of mail-transfer and delivery methods.
mailsend-go is an open-source command-line SMTP client written in Go for scripts, automation, and system administrators. It supports authenticated SMTP delivery, TLS,...
Pros
- Supports SMTP authentication, TLS, HTML messages, and attachments from the command line
- Single compiled Go binary is easy to deploy in scripts and containers
- More focused on one-off message delivery than full mail clients or mail transfer agents
Cons
- Smaller ecosystem and user base than Swaks, msmtp, or curl
- Fewer mail composition and mailbox-management features than s-nail or NeoMutt
- Less suitable than a local MTA for queueing and retrying mail during outages
Free (open source)
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