> 1. Allow sending mail only for a local IP range.
Doesn't allow for the roaming user.

> 2. Require Auth SMTP to send mail.
Not all the clients are compliant and most user wouldn't know how to
configure the ones that are.

> 3. Require POP/IMAP before SMTP (ie. user has to log in to check their mail before 
>they can send any. The permission is based on the IP address used, and times out 
>after X amount of time).  Unfortunately, IMail does not support this.
That is a nice option.  It would be nice if Imail did support.  But they
may in a way.  Can you turn off the SMTP service and only send mail from
the web form?  The web mail requires authentication before you can send
mail.  Or will that stop web mailers from being able to send mail?

Vince
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