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Mario G.Flag for United States of America

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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,
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Mario G.
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Forgot to mention that we are using Exchange in Office 365
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Edwin Hoffer
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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.
Do you use a third party external Spam Filter? or Do you have a third-party whitelisting your recipient addresses?
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.
We only use the defaults in Office 365
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One more technique add your user email id manually in Office 365
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Avatar of Michelangelo
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
I've seen similar issues when user is traveling overseas and at airports.(China and Germany)
Are your users doing any travel?
I think enough solution has been discussed so plz close the question.