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Been a very long time since I worked in IT, but I’m pretty sure at least some mail servers are configured to give up the attempt to deliver sent emails after x number of attempts have failed. Not 100% on this since mail wasn’t my thing, but I seem to vaguely recall that. If I’m right, them the emails most certainly are going somewhere - the “undelivered” graveyard.

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domi@lemmy.secnd.me ⁨19⁩ ⁨hours⁩ ago
The RFC recommends that it should be retried for 5 days. Which is also the default in most mail servers.

However, many larger mail providers, including Microsoft, only do a single day before the mail bounces.

I wonder if this experience makes them reconsider keeping to the RFC recommendation.

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- GreyEyedGhost@piefed.ca ⁨18⁩ ⁨hours⁩ ago
  I find the idea of Microsoft even considering following an open standard to be laughable on the face of it.
  
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  - MonkderVierte@lemmy.zip ⁨16⁩ ⁨hours⁩ ago
    Yeah, that’s rather untypical for them.
    
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    WhiskyTangoFoxtrot@lemmy.world ⁨15⁩ ⁨hours⁩ ago
    Must be why the front fell off of Exchange.
    
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  - WhiskyTangoFoxtrot@lemmy.world ⁨15⁩ ⁨hours⁩ ago
    Embrace, extend.
    
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AmyAye@nord.pub ⁨15⁩ ⁨hours⁩ ago
That could be a hacker movie plot.

“Oh no, the bad guy sent the info in an email! I know, let’s crash the servers until it gets undeliverable!”

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Junkers_Klunker@feddit.dk ⁨21⁩ ⁨hours⁩ ago
You make it sound like that’s a bad thing 😅

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tyler@programming.dev ⁨21⁩ ⁨hours⁩ ago
Microsoft overrode the 24 hour limit to 48 hours to give themselves more time.

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- CompactFlax@discuss.tchncs.de ⁨20⁩ ⁨hours⁩ ago
  But send side from outside MSFT isn’t in their control.
  
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garbagebagel@lemmy.world ⁨20⁩ ⁨hours⁩ ago
This is marginally related but proton has a feature that tells when you when an email is still being retried, and when it gives up.

That email is called something like delayed mail (still being retried), and for a long time, my dumbass thought it was some feature that was being retired and I was like wtf why have they taken months to retire this feature.

Anyway, proton retries for 48 hrs as well.

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- jaybone@lemmy.zip ⁨17⁩ ⁨hours⁩ ago
  Can’t smtp do multiple hops through multiple smtp servers or MX (mail exchanges)? In which case, how would the client know, beyond the first hop?
  
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Safeguard@beehaw.org ⁨14⁩ ⁨hours⁩ ago
First every hour, then every two, four, eight and then like once day for a a week . After that you get a ‘could not deliver this message’.

At least, that is how I setup my servers…

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