Disable EXPN and VRFY in Sendmail to increase security

Feb 25, '03 06:24:00AM

Contributed by: Anonymous

I've found this tip on burningvoid.com's Infrequently Asked Questions page. EXPN and VRFY are two sendmail flags that can compromise the security of your mail server (assuming you've enabled it in OS X). This page describes both variables' functions a bit more fully, and explains how to disable them in sendmail's config file.

I tried it on MacOS 10.2.4 and it worked. I hope this helps..

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Mac OS X Hints
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