On 20/06/24 04:35, John Levine via Postfix-users wrote:
It appears that Peter via Postfix-users <pe...@pajamian.dhs.org> said:
On 19/06/24 18:51, Tan Mientras via Postfix-users wrote:
Hi
*Trying to setup email REJECT when users try to send to a no-reply email.*
There is no such thing as a no-reply email, there is no part of the
email specification that allows a message to be marked as unable to be
replied to.
You might want to take a look at RFCs 7504 and 7505.
Those discuss means by which an entire domain or server can be set to
not accept mail. I'm referring to setting the envelope sender and/or
From: header in a message to an invalid address which is questionable at
best and disallowed by RFC at worst.
IRT the Envelope sender see RFC 5321 4.5.5 where it says:
"All other types of messages (i.e., any message which is not required by
a Standards-Track RFC to have a null reverse-path) SHOULD be sent with a
*valid* (emphasis added), non-null reverse-path."
In this case "reverse-path" is a reference to the envelope sender.
For the From: header RFC5322 3.6.2 says:
"In all cases, the "From:" field SHOULD NOT contain any mailbox that
does not belong to the author(s) of the message."
...which at the very least strongly suggests that the mailbox should be
valid.
I do agree that sending mail you can't reply to is rude, regardless
of the technical details.
Indeed, and how difficult is it for these companies to set it to a help@
or info@ mailbox anyways?
Peter
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