On 16-03-18 11:28 AM, Rodgers, Anthony (DTMB) wrote:
“…delete it without delivering it to the intended recipient’s INBOX or
Junk folder with no NDR…”
When did dropping mail on the floor become acceptable? Or am I just grumpy?
Nobody wants backscatter, but that’s what SMTP-time DSNs are for, no?
Dropping Email has been acceptable ever since unwanted email has occurred.
There are obvious cases where this is the only option. Technically, the
ONLY case where email can be rejected, is during the MUA->MTA or
MTA->MTA connection. Once that connection has been severed, there is no
guaranteed way that any form of notifying the sender will work, as the
'sender' address cannot be guaranteed to be valid, or accept any form of
non-delivery.
Once the email handler takes ownership, of course it can set any
standards on what it wants to deliver. For instance, if it believes the
message is spam, and the recipient has requested that 'all' email be
forwarded to a remote account, forwarding that email could make it
appear that the forwarder is the source of spam.
Should you deliver malicious or harmful vectors to a person's email box?
(Eg, a Virus laden attachment?)
What if you are in jurisdiction where delivering emails of a specific
content is illegal?
What if the recipient has indicated that he wants it dropped, rather
than be delivered?
There are many reasons why rejection action cannot always happen at
'SMTP-time', however yes that should be the first line of defence.
And especially in very high volume environments, not all delivery logic
is possible during SMTP (well, anything is possible), especially in
mixed use environments, where the logic needed to determine file
routing/filtering may take longer than is acceptable for an SMTP
conversation.
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