In <Pine.NEB.3.96.980620002733.10679F-100000@like.duh.org> Todd Vierling <tv@pobox.com> writes:

>Greg, you need to check your mailer's setup:
>
>... while talking to mail.weird.com.:
>>>> HELO duh.org
><<< 501 EHLO requires a valid host name as operand: 'duh.org' rejected from like.duh.org remote address [207.30.95.211]: Unknown host.
>554 <woods@weird.com>... Service unavailable
>
>If you check DNS records, you'll see that duh.org has a perfectly valid MX
>address, even though it has no A record.  "Bzzzt, try again!"
>
>Considering that it bounced my response to your bug response, I hope you
>either got the mail through this list, or you can just go query the PR for
>it.  I'm too tired tonight to deal with this bogosity.

This is probably the same as sendmail 8.9.0 is doing. It bounced all
mail from NetBSD.ORG for the same reason (but based on the envelope
sender). The cause turned out to be the HasWildcardMX option in
sendmail.cf. I changed 
    O ResolverOptions=HasWildcardMX
into
    O ResolverOptions=-DNSRCH -DEFNAMES
This does not really do exactly what I want, but it works for now.

I sent a bug report to the address at sendmail.org that the
HasWildcardMX is apparently being used where it shouldn't.

>-- Todd Vierling (Personal tv@pobox.com; Bus. todd_vierling@xn.xerox.com)

-Olaf.
--
___ Olaf 'Rhialto' Seibert                D787B44DFC896063 4CBB95A5BD1DAA96 
\X/ * You are not expected to understand this.    rhialto@polder.ubc.kun.nl