Emails being blocked by Gmail from office 365

Anonymous
2023-03-02T23:25:26+00:00

When the emails is sent to gmail its being blocked stating

Delivery has failed to these recipients or groups:

___@___.___ (***********@gmail.com)

Your message wasn't delivered because the recipient's email provider rejected it.

all my records are up to date..

gmail.com suspects your message is spam and rejected it.

natasha.daniel Office 365 gmail.com
Sender Action Required
<br> --- --- --- --- ---
Messages suspected as spam
How to Fix It
Try to modify your message, or change how you're sending the message, using the guidance in this article: Bulk E-mailing Best Practices for Senders Using Forefront Online Protection for Exchange. Then resend your message.
If you continue to experience the problem, contact the recipient by some other means (by phone, for example) and ask them to ask their email admin to add your email address, or your domain name, to their allowed senders list.

Was this helpful?Send feedback to Microsoft.

More Info for Email AdminsStatus code: 550 5.7.350

When Office 365 tried to send the message to the recipient (outside Office 365), the recipient's email server (or email filtering service) suspected the sender's message is spam.

If the sender can't fix the problem by modifying their message, contact the recipient's email admin and ask them to add your domain name, or the sender's email address, to their list of allowed senders.

Although the sender may be able to alter the message contents to fix this issue, it's likely that only the recipient's email admin can fix this problem. Unfortunately, Office 365 Support is unlikely to be able to help fix these kinds of externally reported errors.

Original Message Details

Created Date: 3/2/2023 11:29:38 PM
Sender Address: *********@*****.com
Recipient Address: *********@gmail.com
Subject: Email check

Error Details

Reported error: 550 5.7.350 Remote server returned message detected as spam -> 550 5.7.1 [2a01:111:f403:700f::715 19] Our system has detected that this;message is likely suspicious due to the very low reputation of the;sending domain. To best protect our users from spam, the message has;been blocked. Please visit; https://support.google.com/mail/answer/188131 for more information. c23-20020aa7c997000000b004ace5dc6b61si945041edt.369 - gsmtp
DSN generated by: PN3P287MB0113.INDP287.PROD.OUTLOOK.COM
Outlook | Windows | Classic Outlook for Windows | For home

Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

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  1. Anonymous
    2023-03-18T21:19:22+00:00

    what is the fix for this now?

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  2. Anonymous
    2023-03-20T23:54:45+00:00

    Same thing here, as per my finding this is something with MS SPF record, when the email uses their IPV6 address to deliver emails is when it is failing when it uses ipv4 it goes through..

    OK, so thanks to this I was able to find a temporary workaround, at least for gmail accounts.

    I looked for the MX records for gmail.com, using mxtoolbox, and took note of a few IPv4 addresses. They apparently rotate these addresses, but whatever.

    Then in Exchange Admin, I created a conector from Office365 to Partner organization -> for emails sent to *.gmail.com -> route mail through smart hosts, and added all the IPv4 addresses.

    Finished creating the connector, saved it and that's it. All emails to gmail are going through now.

    Of course we still can't send emails to our customers that are hosted by google, but it's better than nothing. I guess I can create individual connectors for them. Not ideal.

    Anyway. I hope this workaround holds and that this helps someone.

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    5 people found this answer helpful.
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  3. Anonymous
    2023-03-21T13:26:26+00:00

    Has anyone found a solution, please?

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    1 person found this answer helpful.
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  4. Anonymous
    2023-03-29T15:42:27+00:00

    I'm having the same issue and I am using GoDaddy! I originally set up my business email with GoDaddy until it magically turned into Microsoft 365. I have no idea what to do. Yesterday I was emailing a client back and forth in my 365 email, via phone app like I do every day. Then randomly one of my responses was returned saying it was "rejected by the recipients server" due to unauthorization or whatever???? Then I emailed again the same message a few minutes later and they received it. I'm baffled.

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    2 people found this answer helpful.
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  5. Anonymous
    2023-03-29T15:50:01+00:00

    My solution is still working.

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    1 person found this answer helpful.
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