Does anyone have exact info on how this is done?
Is the lookup based on the info pulled from the MX record or the domain of
the sender?
If the MX record is mail.domain.com, does it look for the entire name or
just domain.com?
What about Firewalls and Spam software that does extensive checks to
validate, what do they look for?
I have found the following:
http://bind8nt.meiway.com/itsaDNSmess.cfm
http://www.faqs.org/rfcs/index.html <--- Greek
TIA,
D
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