Re: [Ext] trolling

[Ryan Hamel via NANOG <nanog () lists nanog org>]

Endre,

Exchange only sends one reply to each sender 
(https://learn.microsoft.com/en-us/troubleshoot/exchange/client-connectivity/one-reply-sent-sender), and it's also 
configurable too 
(https://learn.microsoft.com/en-us/troubleshoot/exchange/email-delivery/understand-troubleshoot-oof-replies).

Ryan Hamel

________________________________
From: Endre Szabo via NANOG <nanog () lists nanog org>
Sent: Monday, November 10, 2025 10:50 PM
To: nanog () lists nanog org <nanog () lists nanog org>
Cc: Endre Szabo <endre.szabo@nanog-list-sfegrr.redir.email>
Subject: Re: [Ext] trolling

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On Mon, Nov 10, 2025 at 15:14:26+0000, Giorgio Bonfiglio via NANOG wrote:
> Also, speaking about technical limitations - which mailserver in the world does send one auto-reply PER MESSAGE to 
> the same sender? I haven’t seen this in ages, most seem to be sending only once or at worst once every day or so.

Oh, I know the answer to this one! It's a niche player in the market, and it's well known for not following standards 
or best practices. Like, they could have ignored messages with List-* headers, for example, right? The server in 
question is called Microsoft Exchange.

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