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47451047 avatar image
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47451047 asked KaelYao-MSFT commented

Long mail delivery

Hello. There is 1 Exchange server 2019. Sometimes emails come in an hour or two later. Sometimes right away. How to diagnose?

office-exchange-server-administration
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Hi @47451047

As Andy suggested, you may use the message header for analysis.

Besides, does this issue occur on a certain sender domain or on certain recipients in the organization?

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47451047 avatar image
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47451047 answered KaelYao-MSFT commented

I saw in the get-queue that performance problems on the S:\Q drive

I expanded the disk space there and the delays disappeared. It was 700Gb of 11.5TB

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Hi @47451047

Thanks for the update.
It should be a back pressure problem. I suppose you may find some event 15006 in the application log.

Please feel free to mark your reply as the answer to the question if it is resolved by adding disk space.
It would help other community members as well.
Thanks for your understanding!

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Hi @47451047

If the issue has been resolved, please feel free to mark the helpful replies as answers.
This will make answer searching in the forum easier and be beneficial to other community members as well.

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AndyDavid avatar image
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AndyDavid answered

Take a look at the message headers first for a message that is taking a long time.
That will tell you where the delay is.

You can copy and paste then into this header analyzer to easily see that:
https://mha.azurewebsites.net/



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47451047 avatar image
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47451047 answered KaelYao-MSFT commented

I see that Edge sent to the Mailbox server with a delay of 45 minutes. I don't know how to fix this.

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Can you find some related events generated during that period in event viewer>application log on the edge transport server?
I suppose it may be a back pressure problem.

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[PS] C:\Windows\system32>Get-MessageTrackingLog -Sender "lontonusvrn@mail.ru" -Start (Get-Date).AddHours(-48)

Timestamp EventId Source Sender Recipients MessageSubject


08.09.2021 17:38:48 RECEIVE SMTP lontonusvrn@mail.ru {repin.kir@resolea... Re: RE: Прицеп Диз...
08.09.2021 17:38:49 DEFER SMTP lontonusvrn@mail.ru {repin.kir@resolea... Re: RE: Прицеп Диз...
08.09.2021 17:53:49 DEFER SMTP lontonusvrn@mail.ru {repin.kir@resolea... Re: RE: Прицеп Диз...
08.09.2021 18:08:50 DEFER SMTP lontonusvrn@mail.ru {repin.kir@resolea... Re: RE: Прицеп Диз...
08.09.2021 18:23:51 SENDEXTERNAL SMTP lontonusvrn@mail.ru {repin.kir@resolea... Re: RE: Прицеп Диз...


I

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Hi,
Did it only happen on a specific sender?

And can you find some events (for example, event 15004-15007) logged in the event viewer>application log during this DEFER period(08.09.2021 17:38:49-18:08:50)?

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