Re: [Ext] trolling

[Zach Hanna via NANOG <nanog () lists nanog org>]

agree Gary. There's a reason my day job moved their 280k+ employees (plus
countless non-human mailboxes) from Lotus Notes to Microsoft. It's been
working much, much better since the move.

On Tue, Nov 11, 2025 at 9:35 AM Gary Sparkes via NANOG <
nanog () lists nanog org> wrote:

> Can confirm on that one, Exchange / Outlook are the ones that play
> extremely well in this scenario. Microsoft learned these lessons very early
> on.... One hilarious example was internal to them in 1997, for instance
> (not the same type of problem, but still one of many things that they
> learned well early in exchange's life).
>
> For all MS's faults, Exchange really is a damn good product at the end of
> the day if it's set up per documentation (ie: not a single server) and you
> actually use any of its functionality. It's the most set-it-and-forget-it
> and self-healing system outside of normal patching I've ever had to deal
> with at scale (largest of 70k users, smallest of 100 users).
>
> -----Original Message-----
> From: Ryan Hamel via NANOG <nanog () lists nanog org>
> Sent: Tuesday, November 11, 2025 2:16 AM
> To: nanog () lists nanog org
> Cc: Ryan Hamel <ryan () rkhtech org>
> Subject: Re: [Ext] trolling
>
> 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
>
> Caution: This is an external email and may be malicious. Please take care
> when clicking links or opening attachments.
>
>
> 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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