swaks
Swiss Army knife for SMTP testing
swaks is a flexible command-line SMTP transaction tester used to diagnose and verify self-hosted mail servers. It can craft and send test messages with fine control over the SMTP conversation.
Key features
- Command-line SMTP tester
- Fine control over SMTP transactions
- Diagnoses mail server issues
Strengths
- Released under the GPL-2.0 license
- Easy to set up — beginner-friendly
- Active community (1.3k GitHub stars)
- Written in Perl
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