pros and cons of demanding authentication when sending email

[Charlie Derr <cderr () SIMONS-ROCK EDU>]

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Greetings esteemed colleagues,
     I'm looking for feedback on a change that may be upcoming on our network.  Up until now we've allowed anyone
on-campus (we're a small liberal arts college with only a few hundred resident students) to send email without
authentication.  We've demanded off-campus connections (via SMTP w/SSL) authenticate with a username and password for
many years now.

     Does anyone still allow unauthenticated sending of emails from on-campus?  If you've recently switched your policy
to deny this feature, has there been any fallout?


             thanks much in advance for any info,
                      ~c
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