Re: A request to all mail admins
From: Hubert Chan (hubert_at_uhoreg.ca)
Date: Thu, 28 Aug 2003 12:48:43 -0400
>>>>> "Jem" == Jem Berkes <email@example.com> writes:
Jem> One suggestion that has been well formulated is the RMX resource
Jem> record in DNS. A domain owner would list all mail servers
Jem> authorized to send mail on behalf of the domain name. Mail servers
Jem> that support RMX checking would do a type=RMX lookup on the domain
Jem> name in the From field, and get back a list of authorized relay IPs
Jem> for the domain. Then it's a simple check; is the connecting mail
Jem> relay one of these authorized IPs?
I don't like this. I have more than a handfull of email addresses,
used for different purposes. Right now, all of my outgoing mail gets
sent through a single SMTP server. If this scheme caught on, I would
have to set up my mail client to use a different SMTP server for each
As it stands, I can also let a friend use my MUA to send a mail, and
change the From: header to his address, if he cannot access his own MUA
for any reason (e.g. he's away from his computer) and needs to send a
mail. This would not be possible under the proposed scheme.
I'm sure there are a dozen other things that would break.
What would make more sense, I think, is to have another header,
"Sent-From" (is that already a standard header?), that indicates the
account the mail was sent from, and do RMX checking on that. If the
"Sent-From" header does not exist, fall back to the "From" header.
-- Hubert Chan <firstname.lastname@example.org> - http://www.uhoreg.ca/ PGP/GnuPG key: 1024D/124B61FA Fingerprint: 96C5 012F 5F74 A5F7 1FF7 5291 AF29 C719 124B 61FA Key available at wwwkeys.pgp.net. Encrypted e-mail preferred.
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