On Thu, May 08, 2003 at 11:19:54AM -0600, Vernon Schryver wrote:
1. an SMTP server first compares the reverse DNS name of the SMTP
client with the sender domain. If they match by the usual rules
(e.g. user(_at_)example(_dot_)com matches mailhost.example.com), then the
STMP
client is authorized. To prevent forgery, the usual reverse-forward
DNS check is made.
This doesn't work in common. A host can have only one reverse DNS
name, but deliver for many different domains.
Hadmut
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