swaks ☆

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Description:
SMTP command-line test tool

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: Developer tools

Tags: smtp email testing networking cli

Install: brew install swaks

About:
Swaks is a feature-rich command-line tool for testing SMTP servers and email configurations. It allows users to craft and send arbitrary SMTP transactions, providing detailed diagnostics for troubleshooting. Its primary value is in validating email setups, debugging mail server issues, and automating email delivery tests.

Key Features:

Supports various SMTP authentication methods (PLAIN, LOGIN, CRAM-MD5)
Allows for complete control over SMTP headers and message body
Provides detailed transaction logging for debugging
Supports TLS/SSL connections for secure email testing

Use Cases:

Verifying email server configuration and connectivity
Debugging issues with email delivery or spam filtering
Automated testing of email-dependent applications

Alternatives:

curl – More general-purpose network tool; Swaks offers specialized SMTP features and easier syntax for email testing.
telnet – Manual and low-level; Swaks automates the SMTP protocol handshake and supports modern features like TLS.

Version History

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