OT: Seeking opinion about reverse-DNS lookups on SMTP HELO

[HaJo Schatz]

To combat spam I have enabled reverse-DNS lookups of incoming SMTP 
connections. If the FQDN does not match the HELO-Identity, I reject the 
connection with a 550 Error.

I have now found that this breaks communication even with reputable 
(well, an international bank that is) peers. Dunno how much more mail I 
may have lost through this... How are you out there handling that, are 
you doing reverse-lookups?

-- 
HaJo Schatz <hajo at hajo.net>
http://www.HaJo.Net

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