Swaks
Swiss Army Knife for SMTP — scriptable SMTP transaction testing for engineers.
Overview
Swiss Army Knife for SMTP — scriptable SMTP transaction testing for engineers.
Vendor: Open source
Primary purpose
Craft and inspect SMTP conversations for debugging delivery paths.
Best for
- Engineers validating SMTP, STARTTLS, and auth behavior
Common use cases
- Test relay permissions
- Reproduce SMTP failures
Advantages
- Precise SMTP control
- Scriptable
Limitations
- Does not score spam content
When not to use it
- Non-technical operators who need a GUI
Pricing
Free open-source utility.
Official website
Inputs and outputs
Typical inputs
- SMTP target
- Message options
Typical outputs
- SMTP transcript
Privacy notes
- Review each vendor’s data handling before uploading production lists or message content.