Users getting email dalayed messages, or blocked

Some external users getting blocked or delay messages when sending emails to us. This happened before, but we were not able to trace the issue.

We have only the default rules enabled in Office 365, nothing fancy, so I am not sure what is causing this issue.

Thanks,
Mario G.SupportAsked:
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Mario G.SupportAuthor Commented:
Forgot to mention that we are using Exchange in Office 365
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Edwin HofferTechnical ExpertCommented:
Hi,

You can try several method these are:

1. Check Office 365 Service Health For Exchange Online Issue.
2. Use Mail Flow Troubleshoot to Find Missing Emails.

I am attesting a link plz go through:

https://support.office.com/en-us/article/find-and-fix-email-delivery-issues-as-an-office-365-for-business-admin-e7758b99-1896-41db-bf39-51e2dba21de6

Thanks
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Mario G.SupportAuthor Commented:
Sorry, I forgot to mention that the users reporting this issue are external users using their own domain not internal users, i.e. one of our board members reports he gets delayed, or blocked messages when he emails one of our internal users. He owns his domain name and uses that domain to send emails to us.
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Edwin HofferTechnical ExpertCommented:
Do you use a third party external Spam Filter? or Do you have a third-party whitelisting your recipient addresses?
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Mario G.SupportAuthor Commented:
good question, he says that only email sent to one user (internal) at times get this message (delayed, blocked), emailing another user internally doesn't get the same message, even though it is the same domain.
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Mario G.SupportAuthor Commented:
We only use the defaults in Office 365
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Edwin HofferTechnical ExpertCommented:
Grant yourself Full Access to the sick user's mailbox, log into OWA as yourself - use the Mailbox selector in the top right corner to switch to the sick user's mailbox. Select all unread messages and forward to specified user. Log out of OWA, remove Full Access to sick user's mailbox for your account.
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Edwin HofferTechnical ExpertCommented:
One more technique add your user email id manually in Office 365
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Mario G.SupportAuthor Commented:
the issue is that I don't have control over the external user's access.

user 1 sends email from me@wonhouse.com to user 2 @ email@coop.coop.

User 1 gets messages from Office 365 that his email was delayed, or blocked when sending to user 2.

Hope this helps to clarify the process. Sorry for the confusion.
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Edwin HofferTechnical ExpertCommented:
Thanks for the updates. To help narrow down the issue, please choose a recent delayed email, and then:

1 . Upload the mail header for further check.

2 . Use the Office 365 admin account and run a message trace of this email, and upload the full results.

The mail header will check if the delay happens when the email is sent to the Office 365 server, and the message trace can help check if the delay happens when the email sent from the Office 365 server to the mailbox.
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MichelangeloConsultantCommented:
Mario,
you have to provide the error message the external user get when sending to your user. It could well be that the internal user put by mistake (or by need)  the external user in his own blacklist.

good question, he says that only email sent to one user (internal) at times get this message (delayed, blocked), emailing another user internally doesn't get the same message, even though it is the same domain.

This is not clear at all. let's clarify:
externalueser1 ->emailto-> internaluser1 is ok? if failed, provide exact error message. If dalayed, provide exact delay message
externalueser1 ->emailto-> internaluser2 is ok? if failed, provide exact error message. If dalayed, provide exact delay message
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pgm554Commented:
I've seen similar issues when user is traveling overseas and at airports.(China and Germany)
Are your users doing any travel?
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Edwin HofferTechnical ExpertCommented:
I think enough solution has been discussed so plz close the question.
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