On 3/24/23 4:01 PM, Heiko Schlittermann via mailop wrote:
Hm. Maybe I'm stupid.
Nope. I'm sure that's not the case. We all learn things when exposed to new things. ;-)
What does this change? From senders PoV it is a temporary error. The sender will retry.
NoListing works by causing the sending server to cascade through multiple MXs.
First MX either doesn't respond /or/ sends a TCP reset. Thereby causing the sending MTA to try the next MX.
The next MX responds like normal.The cascading from one MX to the other MX achieves a very similar result as grey listing. But it does so in a way that is indifferent to the actual addresses used.
There is also no state to be maintained by the receiving system.
And on my side I still do not recognise their 2nd attempt, if they use a variable MAIL-FROM.
With no state to maintain it doesn't matter what the envelope from is, variable or static.
-- Grant. . . . unix || die
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