[imp] hardening imp against spammers

[Jon Lewis]

On Wed, 29 Jun 2005, Lord Apollyon wrote:

> Well, I know that sendmail has a configuration item for this.  Unless you're
> running some kind of mailing list, there's little good reason to allow more
> than 40 recipients in a given email transaction.

I knew sendmail had this feature, though I'm unsure if it's applied to a
locally invoked sendmail vs an SMTP session.  That was why I started out
trying to hack it into qmail.  I gave up when I couldn't get my hacked up
qmail/sendmail to link.  Doing it in IMP turned out to be much simpler and
has the advantage of being portable to any mailer system.

----------------------------------------------------------------------
 Jon Lewis                   |  I route
 Senior Network Engineer     |  therefore you are
 Atlantic Net                |
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