The "Noob Link" Technical Reference
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Some helpful security sendmail configuration options.
These settings are found in various sendmail files.
They make spammers and crackers lives tougher.
They will in no way secure sendmail! They just help.


File: sendmail.cf

Change this line: O PrivacyOptions=authwarnings
to this line: O PrivacyOptions=authwarnings,noexpn,novrfy

What does this do?: It prevents spammers from using the ``EXPN'' and ``VRFY'' commands in sendmail. They can be used to find and verify E-mail addresses.

File: sendmail.cf

Change this line: O SmtpGreetingMessage=$j Sendmail $v/$Z; $b
to this line: O SmtpGreetingMessage=$j $b

What does this do?: Gets rid of the connection banner version number and the advert of "Sendmail".