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- smtpscan is a remote SMTP server version detector. It can be used to
- guess which mail software is used on a remote server, that may hide its
- SMTP banner.
- smtpscan works by testing the remote SMTP server reaction, thanks to
- tests defined in the tests (${PREFIX}/share/smtpscan/tests) file. Almost
- all of those tests consists in weird SMTP request, whose answer is not
- precisely defined in the corresponding RFCs. Some other times, they check
- whether the remote SMTP server is simply RFC compliant. After each test,
- remote server returns a SMTP Error Message. Fingerprints are made of
- SMTP Error Messages corresponding to the tests.
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