Microsoft Outlook 365 - Exchange Hosted email

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frankmachine

49 posts

Geek

#290729 30-Nov-2021 18:32

Good day

Can anyone advise with confidence if there is a specified minimum upload and download speed over which email will be sent/received, when using Microsoft 365 Exchange servers? Or put another way is there a specified threshold under which email delivery (in either direction) is possibly not guaranteed? I am referring only to MS Exchange hosted email via 365.

Many thanks

frank

SATTV

1480 posts

Uber Geek

#2822103 30-Nov-2021 20:42

Upload and download is restricted to prevent saturation of the network during working hours, from what I understand it is the server locations working hours. ( have never seen a full speed upload ) There are some third party software's that have several channels going thus speeding up the upload when a migration is being done.

You are sharing the server with hundred or thousands of other users, even people in the same tenancy can be on different servers.

Does that help?

John

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frankmachine

49 posts

Geek

#2822143 30-Nov-2021 21:43

Thanks, informative but not quite what I'm seeking. The situation is that some internet emails are not being received. There is no pattern to senders domains or times. The recipient is connected via Spark 4G modem and the download is a respectable 20-30mb/s but the upload is a miserable 600k average... I am theorising this is possibly the issue, or at least part of the issue... The Outlook client will go into Not Responding periodically also. The Windows PC which it resides on is functioning fine, task manager observed and nothing of concern to report.....

mrdrifter

522 posts

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#2822151 30-Nov-2021 22:06

As far as I know it should work right down to 56Kbps - back in ~2011-2014 they actually published the 56Kbps per user in the org as a target for OK (not necessarily great) use of O365. In saying that, the client connection speed shouldn't impact exchange receiving emails from a third party and storing them if they are being routed properly - it just might make retrieving them a bit slower. Checked the MX records?

CYaBro

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#2822171 30-Nov-2021 23:17

Are the emails showing in the Outlook web app?

bagheera

459 posts

Ultimate Geek

#2822267 1-Dec-2021 08:45

frankmachine:

Thanks, informative but not quite what I'm seeking. The situation is that some internet emails are not being received. There is no pattern to senders domains or times. The recipient is connected via Spark 4G modem and the download is a respectable 20-30mb/s but the upload is a miserable 600k average... I am theorising this is possibly the issue, or at least part of the issue... The Outlook client will go into Not Responding periodically also. The Windows PC which it resides on is functioning fine, task manager observed and nothing of concern to report.....

Are they spamming emails? the one time I have seen "The Outlook client will go into Not Responding periodically" is when the person hit the MS send limit on the number of email and hit the throttle - none responding, then MS let the next 30 email through - responding, hit limit, lock up again

here a list of all the limits https://docs.microsoft.com/en-us/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits

jaymz

1132 posts

Uber Geek

#2822309 1-Dec-2021 09:43

If you suspect an issue with transmission, I would look to gather the logs from the Exchange Online and cross reference them with the emails that were sent from the client end. That way you can see if delivery was completed, attempted, or errored out and work from there.

https://serverfault.com/questions/645484/how-to-export-a-full-smtp-log-in-office-365

I recently had a case where one sender's emails would always go into Spam for the receiver, as it turned out, an incorrectly configured DKIM cert was at fault.

Message tracking logs are your friend when it comes to tracking down "why didnt my email send/arrive?" issues.

Good luck and happy hunting!

1101

3086 posts

Uber Geek

#2822357 1-Dec-2021 10:53

frankmachine:

The Outlook client will go into Not Responding periodically also. The Windows PC which it resides on is functioning fine, task manager observed and nothing of concern to report.....

Ive seen similar Outlook issues with 365 .
Easiest fix/test , create a new Outlook profile , set it up in uncached mode .
Sometimes need to delete all old profiles & ost/psts (backup PST first) . May need a repair install of Office

What can sometimes happen is sync issues jamming things up. Go into 365 webmail, and look at the actual size of the sync issues folder . Also look at the sync issues folder in Outlook. You can clear sync issues folder via Webmail (in settings/options folder size ), although it wont clear completely if its really bad.
At its worst , Ive seen sync issues folders balloon to over 30Gb .

Can also be caused by corrupt PST or OST , PST too large (over 20Gb) , too many a/c's setup in outlook .
Can also be issues with shared mailboxes & shared folders .

Outlook Uncached mode fixes many issues . (100% uncached , not partial )

If more than 1 a/c in outlook , can be a single a/c screwing things up. You'd need to test by removing the 2nd , 3rd a/cs from Outlook .

frankmachine

49 posts

Geek

#2822460 1-Dec-2021 12:14

Yes I've already done the new Outlook profile thing and also unticked the cached exchange mode box. The mail file is about 15GB, purely .OST of course, no PST as its Exchange 365. The mail file is about 15GB so getting up there but MS sell it under the Business plan as a 50GB mailbox capacity, so............... I will check the sync issues log area in the webmail, thank you....

mrdrifter

522 posts

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#2822565 1-Dec-2021 14:08

frankmachine:

Yes I've already done the new Outlook profile thing and also unticked the cached exchange mode box. The mail file is about 15GB, purely .OST of course, no PST as its Exchange 365. The mail file is about 15GB so getting up there but MS sell it under the Business plan as a 50GB mailbox capacity, so............... I will check the sync issues log area in the webmail, thank you....

Keep in mind that the 50GB mailbox size doesn't mean that the OST file will support 50GB, best to check the maximum OST file size setting on it. I believe this can be checked in the registry. If everything is working within the O365/Exchange online webmail interface, it's likely to be specifically something around Outlook.

frankmachine

49 posts

Geek

#2822630 1-Dec-2021 15:00

agreed and that is where I'm focussing my attention now.... thanks 👍