ietf-mxcomp
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Re: Why we should choose the RFC2821 MAIL FROM/HELO identities

2004-03-25 09:55:21

On Mar 25, 2004, at 17:05, Alan DeKok wrote:

RMX etc. require pre-registration of all of the places you may send
mail under ONE condition, and one condition ONLY: If you send mail
from those places as an SMTP client, and claim association with a
third-party domain, where there is no other method for the recipient
MTA to verify that claim.

And, on top of that, we talk about something you in that case can do with about 10 lines of /bin/sh script, given you have put a pulic key in your DNS as a KEY RR.

Dynamic update of DNS is a no-brainer nowadays. At the same time you update the A record of your box which changes IP address, you also update the "RMX" record.

   paf