I think I see a (tangential) miscommunication in this thread.
On Tue, 2007-07-17, SM wrote:
At 10:22 17-07-2007, Dilyan Palauzov wrote:
Let's limit us now on hosts, that do not offer PRDR.
** 550 Mail for mailing-list(_at_)example(_dot_)org rejected **
The 550 code means that mail to the above-mentioned recipients
mailing-list(_at_)example(_dot_)org was rejected for policy reasons. A DSN
may be sent by server.example.com
to both recipients. The recipients may not see your reject
message or they may not understand it.
Is there any software nowadays, that sends DSN to the recipients
telling them that they cannot receive emails?
Some MTAs still send DSNs to the recipients to inform them that their
email could not be delivered. For example, if this email is not
accepted by the mail server that operates this mailing list, I will
get a DSN from my mail server.
I believe that the first mention of DSNs above should have said:
A DSN may be sent by server.example.com to _the original message's
bounce address on behalf of_ both recipients.
I don't believe that an MTA would send a Delivery Status Notification to
_recipients_ that it has determined should not get the original message!
I don't think that this materially affects this discussion but I thought I
would point it out.
Bill McQuillan <McQuilWP(_at_)pobox(_dot_)com>