Please do NOT copy me on mail sent to the ASRG list.
Yakov Shafranovich wrote:
At 11:11 AM 6/29/2003 -0400, Richard Rognlie wrote:
...
RMX (et al) deal with the envelope from address. This proposal has
nothing to do with the envelope. It is an attempt to sanitize the
hostname specified as the HELO/EHLO when connecting to a remote
MTA.
[..]
Dealing with the return envelope has its own problems (DSN messages with
empty MAIL FROM <>) so it seems that dealing with the HELO/EHLO is better.
BUT, the bottom line is that both proposals are DNS based and propose
additional DNS records. Whether the filtering is done on HELO/EHLO level or
return envelope is something to be left to the implementators. Both
proposals are basically the same - they are mandating DNS records.
Both proposals require a database where domain name owners can declare
which IP addresses may use the domain name and how those IPs may use it;
DNS is a natural choice here.
Raymond S Brand
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