[Mimedefang] obtaining the senders IP address within filter_begin

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--- On Tue, 6/1/10, TLD MimeDefang <tld.mimed at stimulacra.com> wrote:
> > ... in addition, some of them are available in filter_relay,
> > filter_sender or filter_recipient.  If this is the case, it will
> > be noted below."

Although accurate, replacing "If this is ..." with "Where this is..." is better diction.