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Re: Paul's Mailfrom (Was: IETF SMTP Working GroupProposal at

  • From: Brad Knowles
  • Date: Tue Aug 27 16:59:51 2002

At 7:02 PM -0400 2002/08/26, Scott Gifford wrote:

 The proposal suggests that you get all of the A records for all of the
 accepted names, then make sure that one of the A records matches the
 address that the connection came from.  See sec. 2.3.
Right. And when they add a new mail gateway and don't tell you about it? What if they have forty-five of the damn things, each with its own unique name?

 Even if it did require good reverse DNS, that would only be needed for
 domains that chose to implement this, and only for addresses that
 are allowed to send mail from that domain.
So, if you can't send mail out directly, you pass it on up to your ISP. And if they can't send the stuff directly, they pass it up another level. And so on. And you have to know all the possible IP addresses that could be used as exit points for your mail.

Yeesh. Ya know, even X.400 wasn't this silly.

Brad Knowles, <>

"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety."
-Benjamin Franklin, Historical Review of Pennsylvania.

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