... So if we clarify that the recommended practice is to "silently
discard" (as some have described it), won't we have solved this
particularly problematic work flow?
You're right, then it just falls back to mail mysteriously disappearing.
why can't the MLM send bounce back to sender's mail-from address?
The MLM can't tell the difference between a rejection due to the recipient
address being invalid and due to ADSP. Rejecting due to ADSP is probably
wrong due to the spec, but sending mail to a list from a domain publishing
ADSP discardable is definitely wrong, so apportion the blame as you wish.
John's response seems to imply that it is sender's responsibility not to
send to lists in first place (if they use discardable). But can we be sure
this will happen?
Of course not. That's an example of the reason that I don't find ADSP
useful (as opposed to manually vetted discard lists.) There's no way to
tell whether the party publishing discardable understands what they're
- Wouldn't we have same problem with forwarders? and I don't think sender
can predict whether mail will go thru forwarders....
DKIM is not SPF. It is uncommon for a forwarder to break a DKIM
signature. We designed it that way.
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