[RFCI-Discuss] acceptable filtering of RFC2142 mailboxes?

[Alexey Lobanov]

Hello all.

03.07.2006 22:20, James Ralston пишет:

> Therefore, we are thinking of implementing a restriction that a
> message must either have *all* RFC2142 recipients, or not have *any*
> RFC2142 recipients.  If your message includes both RFC2142 and
> non-RFC2142 recipients, you will receive the following error after
> sending the "." to close the "DATA" command:
> 
> 550 5.7.1 mixing RFC2142 recipients and non-RFC2142 recipients not permitted; please resend to recipients individually
> 
> My read of the rfc-ignorant abuse/postmaster guidelines is that
> filtering on this basis would *not* be grounds for being listed.
> 
> Agreement/disagreement?

In my understanding, this part of RFC2142 has two backgrounds:

1. An erroneously blacklisted [business] partner should be able to
contact our Postmasters to restore broken communications.

2. Anyone should be able to contact our Postmasters to report security
incidents or an abuse originating from our system.

In my opinion, in both cases it is quite possible that the message
in question has CC: to other addresses at our domain. An address
obtained from WHOIS, or a personal address of a known manager, etc.

But... your 550 diagnostic message contains exact and simple instruction
for this case: "please resend to recipients individually".

So, RFC-2124 works as designed.

Alexey