>What newsletters do that?
I see them all of the time.
Some legit send-only list servers use [EMAIL PROTECTED] where:
1. sender@ does not exist (aka no return path), which is RFC illegal.
2. DNS query for MX/A of @label.sender.domain gets an answer, but
trying to contact the MX/A times out.
The types of legit senders that do this are
stock/financial/newsletters (many of which have paid subscriptions),
marketing mail shots, etc.
Len
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