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Re: Underscore in Host names
> No, underscore is valid in host names in DNS, but underscore is
> not valid in a hostname for an RFC821 SMTP transaction.
> I do, though, think that zmailer ought to be more lenient on this one.
Strict RFC-821 is actually pretty stupid, and forbids
common %-hack, et.al. Therefore the smtpserver/rfc821scn.c
is somewhat more lenient than the standard would require..
Adding underscore to the repertoire was not difficult.
/Matti Aarnio <email@example.com> <firstname.lastname@example.org>