Hi John,

Thanks for the input, and you’re correct that I simplified NOTIFY 
unnecesasrily. 
I agree that the semantics don’t line up with what EXPIRE needs. NOTIFY is 
something happened, poll sooner; where EXPIRE is a single, self-contained, 
authenticated deletion with no follow-up required.
Appreciate the clarification.

Best,

Duane


> On Nov 21, 2025, at 19:54, John Levine <[email protected]> wrote:
> 
> It appears that Duane Powers  <[email protected]> said:
>> Hi Kevin,
>> 
>> Great timing on this, I've just spent a bit of time considering it. 
>> 
>> The difficulty is that NOTIFY’s existing semantics and operational 
>> expectations don’t really line up with what EXPIRE needs to do.
>> 
>> Operationally, NOTIFY is almost always constrained to authoritative ->
>> secondary, with specific firewall, ACL, and traffic handling provisions.
> 
> Not any more.  Generalized notify goes from one authoritative to another,
> typically up the tree.
> 
> Nonetheless I agree with you that it's not the right tool here. All of
> the existing uses of NOTIFY say "something happened so do a poll you
> were planning to do, but do it sooner." EXPIRE seems rather unlike
> that.
> 
> R's,
> John
> 

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