My messages always show as sent, but the recipient doesn't receive them. This seriously hinders the already poor communication efficiency. Could you please help me figure out what the reason is? Thank you!

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My messages always show as sent, but the recipient doesn't receive them. This seriously hinders the already poor communication efficiency. Could you please help me figure out what the reason is? Thank you!

Xuhui Wei 20

I am using a .outlook personal account. During communication with an enterprise account, I often found that emails were marked as sent, but no rejection or any feedback was received. However, the other party did not receive my emails. It took me two or three attempts for them to receive them. This seriously affected our already low communication efficiency. I also contacted the online support of outlook.com. They couldn't figure out the reason for my account and asked me to come here to provide feedback.

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Vicky-I 1,815 Microsoft External Staff Moderator

Hi @Xuhui Wei,

Thank you for reaching out to Microsoft Q&A!

I see you confirmed that the emails were marked as “Sent” and you didn’t receive any Non-Delivery Reports (NDRs). So, in this case, the issue is possibly on the recipient’s side, not yours.

To help resolve this, I recommend formatting your message thread and forwarding it to the recipient and tell them double check with their IT administrator some information bellow:

Check the message trace on their mail server to see if your email was blocked, quarantined, or redirected by any mail flow rules.
Verify if your email was flagged as spam or filtered by security policies.
Whitelist your email address or domain if necessary.

You can also share this link with them to help with message trace: Message trace in the new EAC in Exchange Online | Microsoft Learn

Feel free to contact me if there are any further updates on this issue, I'm here to help you further if needed.

Best Regards

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Vicky-I 1,815 Reputation points Microsoft External Staff Moderator

2025-08-26T13:30:45.5133333+00:00

Dear @Xuhui Wei,
Just checking in to see if the above information was helpful. If you have any further updates on this issue, please feel free to post back. At last, if the information we provided give some direction for the issue, please click "Accept Answer" and kindly upvote it, with your vote, other users who are facing same query can easily find this thread and check suggestion when they search on community. Your vote helps other user to resolve their queries.

Warm thanks.
Vicky-I 1,815 Reputation points Microsoft External Staff Moderator

2025-08-27T11:52:53.9566667+00:00

Hi @Xuhui Wei,
I hope this message finds you well.

This is my second follow-up to check whether your issue has been resolved. I truly want to ensure your experience is as smooth as possible. If your problem is still ongoing or if you have faced any new difficulties, please share more details about the current steps you are stuck on. I am here and happy to provide further help whenever you need it.

While waiting for your response, I will continue tracking other customer questions on the forum to ensure everyone receives timely support. If you have additional questions, please feel free to tag my name in your reply so I can assist you promptly and more personally.

Looking forward to hearing from you soon.
Xuhui Wei 20 Reputation points

2025-08-28T07:06:49.28+00:00

Sorry for the delay. Much Appreciated!
Vicky-I 1,815 Reputation points Microsoft External Staff Moderator

2025-08-28T07:46:32.3766667+00:00

Hi @Xuhui Wei,
No worries at all. Glad I could help! Thank you very much for accepting the answer. I’m truly pleased it was helpful to you.
Warmest Regards.

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My messages always show as sent, but the recipient doesn't receive them. This seriously hinders the already poor communication efficiency. Could you please help me figure out what the reason is? Thank you!

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