Of course the main advantage of SF is the ability to reject during the SMTP
dialogue, but in a larger setup it is nice if you can distribute different
functions to different servers (MX, virus scanner, spam analyzer, SPF)
which using ident in SPF would hinder (only a little bit, but it is a
matter of principle).
Does ident prevent this? AFAIK all you need is the port number and ident will
give you the account name attached to it.
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