I turned on BOFHCHECKHELO/BOFHCHECKDNS and it's been a real life-saver with all
these 'bots barraging me with spam from fake (e.g. "HELO 8lpzcod", etc.) hosts.

But I'm on a Yahoo! Groups mailing list that consistently fails:

Mar 23 21:41:14 isolar courieresmtpd: [ID 702911 mail.error]
error,relay=::ffff:98.136.45.86,from=<sentto-12024622-1568-1269405664-earle=xxxx...@returns.groups.yahoo.com>:
517 HELO n61d.bullet.mail.sp1.yahoo.com does not exist.

Mar 23 21:50:49 isolar courieresmtpd: [ID 702911 mail.error]
error,relay=::ffff:98.136.45.70,from=<sentto-12024622-1569-1269406239-earle=xxxx...@returns.groups.yahoo.com>:
517 HELO n71c.bullet.mail.sp1.yahoo.com does not exist.

Mar 26 09:01:37 isolar courieresmtpd: [ID 702911 mail.error]
error,relay=::ffff:67.195.134.233,from=<sentto-12024622-1570-1269619288-earle=xxxx...@returns.groups.yahoo.com>:
517 HELO n5.bullet.mail.sp2.yahoo.com does not exist.

If you look up all 3 of those addresses, they are correct, backwards and
forwards:

[9:15] isolar:/ % host 98.136.45.86 86.45.136.98.in-addr.arpa domain name pointer n61d.bullet.mail.sp1.yahoo.com.

[9:15] isolar:/ % host n61d.bullet.mail.sp1.yahoo.com n61d.bullet.mail.sp1.yahoo.com has address 98.136.45.86

I keep trying to add exceptions in courier/etc/smtpaccess/default but Yahoo!
uses so many different outgoing addresses that it's like trying to play
Whack-A-Mole.

Meanwhile the list owner is threatening to throw me off because of all the
bounces. Wondering why these keep failing?

- Greg

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