Mark Souva
asked on
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
Thank you,
Mark
if you use the portal.office.com to check your emails, do you see them almost instantaneously?
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
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
ASKER
Hi Éric
I still see the delay on the portal.
Mark
I still see the delay on the portal.
Mark
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?
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
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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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.
Also are there attachments on these emails that may be pretty large, or it there any malware and spam scanning on those emails?