Email delays from SMTP server to Exchange 365 cloud accounts

We have Exchange 365 setup in a hybrid mode. We are in the process of moving email accounts to the cloud. We have a distribution list for a group of people for daily emails that come out at 8:01 every morning. The number of emails varies from 20 up to 100. The distribution group has 6 people in it. We are seeing a 30 minute delay on some people getting the emails. I believe this has to do with a limit on the smtp email coming in. Is there a way to increase this limit? The group is on the premises Exchange at this time, so the addresses are getting resolved before going to the cloud.

Thank you,

Mark

ExchangeMicrosoft 365Email ServersOutlook

Last Comment

timgreen7077

8/22/2022 - Mon

timgreen7077

3/28/2018

with 20 -100 emails coming in to a distro group, that is very little email traffic so the default settings a the connectors will support this. I would first suggest looking at the email headers of 1 on the delayed emails, and this will show you where the delay is happening. So whenever one of the users gets the email but it's delayed, view the headers of that email, so that you can see where the delay is occurring.

Also are there attachments on these emails that may be pretty large, or it there any malware and spam scanning on those emails?

Éric Moreau

3/28/2018

if you use the portal.office.com to check your emails, do you see them almost instantaneously?

Mark Souva

3/28/2018

ASKER

Hi Tim,

There are two email addresses on each email. The first being the person that needs it and the distribution group as the copy for follow up. It looks like the person that needs it gets the email at 8:01 and anyone on the distribution list gets it at 8:31 or later. This all started when the people on the distribution list were moved to the cloud. The original person is still on the premises server.

There are PDF attachments in the emails.

Mark

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Mark Souva

3/28/2018

ASKER

Hi Éric

I still see the delay on the portal.

Mark

timgreen7077

3/28/2018

Ok, so the users on-prem are getting the email on time, but the users that are in the distro are all in O365. Is the sender on-prem also or external?

Mark Souva

3/28/2018

ASKER

Tim,

The sender is a server on premises using SMTP relay. We are hybrid mode with all email going to premises then routed accordingly.

Mark

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timgreen7077

3/28/2018

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timgreen7077

3/28/2018

The headers will also confirm that your mail is routing the they you think it should. Is it routing from internal exchange directly to O365 or is it taking another path.