Couldn't deliver the message to gmail users

Question

Couldn't deliver the message to gmail users

JanakKhadka 596

Hi, I've setup SPF, DKIM, DMARC record everything for my domain/M365 Tenant. I can send emails to all other domains except gmail users. The following is the Error Details I get in NDR report. |Error:|550
5.7.350 Remote server returned message detected as spam -> 550 5.7.1
[2a01:111:f403:704b::731 19] Our system has detected that this;message
is likely suspicious due to the very low reputation of the;sending
domain| | -------- | -------- | ||

Can someone please help me to get out of this issue?

Aholic Liang-MSFT 13,886 Reputation points Microsoft External Staff

2023-04-21T09:56:07.5466667+00:00

Hi @ JanakKhadka,

Just checking in to see how things are going on with this thread.

If the reply was helpful, you can click the "Accept Answer" button under this post so that other's with similar question can benefit from this thread as well.

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Aholic Liang-MSFT 13,886 Reputation points Microsoft External Staff

2023-05-02T08:09:51.3966667+00:00

Hi @ JanakKhadka,

I haven't heard back from you for a long time, do you have any other questions about this question?

If the response has helped you, please "accept answer" to help other community members quickly find helpful responses. If you need further help, feel free to post back to the discussion.

Accepted answer

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Aholic Liang-MSFT 13,886 Reputation points Microsoft External Staff

2023-04-21T09:56:07.5466667+00:00

Hi @ JanakKhadka,

Just checking in to see how things are going on with this thread.

If the reply was helpful, you can click the "Accept Answer" button under this post so that other's with similar question can benefit from this thread as well.

If you still have further questions or concerns, feel free to post back.
Aholic Liang-MSFT 13,886 Reputation points Microsoft External Staff

2023-05-02T08:09:51.3966667+00:00

Hi @ JanakKhadka,

I haven't heard back from you for a long time, do you have any other questions about this question?

If the response has helped you, please "accept answer" to help other community members quickly find helpful responses. If you need further help, feel free to post back to the discussion.

Answer 1

Hi @ JanakKhadka,

If you can successfully send mail to other domains, this means that your Exchange settings are correct.

Gmail is using its internal spam algorithm, as the sender we cannot solve this problem from Exchange, I recommend that you contact the recipient or the recipient's email administrator to fix the configuration on their side.

For more information about error 550 5.7.1, you can refer to this link:

Fix NDR error 550 5.7.1 in Exchange Online - Exchange | Microsoft Learn Hope the above suggestions are helpful to you!

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment". Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Answer 2

Saad Khan 11

you can try mailtester to check the score of your email: https://www.mail-tester.com/ check message trace from exchange admin center, what does it say? does it happen with all the senders in the tenant? It could be from gmail side? how many gmail recipients have you tried? you can raise a support ticket with MS and get your tenant/sending ip health check done...

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Couldn't deliver the message to gmail users

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