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All of our emails to gmail accounts are bouncing back. The message we are getting is below. We do NOT spam our customers.

Anonymous
2023-02-23T22:51:29+00:00
More Info for Email Admins
Status code: 550 5.7.350 <br> <br>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. <br> <br>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. <br> <br>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: 2/22/2023 10:54:27 PM <br> --- --- <br> Sender Address: ***************.com <br> Recipient Address: ***************@gmail.com <br> Subject: FREE COFFEE
Error Details
Reported error: 550 5.7.350 Remote server returned message detected as spam -> 550 5.7.1 [2a01:111:f400:7eaa::60f 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. fh2-20020a1709073a8200b008d7300083b3si10148910ejc.238 - gsmtp <br> --- --- <br> DSN generated by: ***************
Outlook | Windows | Classic Outlook for Windows | For home

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  1. Anonymous
    2023-04-25T21:10:13+00:00

    Hey there, we were able to resolve it with the help of IT support. There are still a few places our email will bounce. It really takes a professionals help. Not something the "average Joe" would be able to resolve.

    4 people found this answer helpful.
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  2. Anonymous
    2023-07-05T16:30:35+00:00

    Hi, I had a similar type of issue sending from Outlook. I contacted my hosting company about the issue, and they told me they updated the DKIM and SPF entries for the outgoing email address in question. After that, sending to Gmail addresses worked perfectly.

    2 people found this answer helpful.
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  3. Anonymous
    2023-10-05T06:47:40+00:00

    Hello,

    We had the same problem, but with different error codes. Essentially, Gmail bounced while all other received the email.

    We contacted MS via Help Centre. Two previous Engineers couldn't resolve. But the third Engineer did. This is all he did.

    He looked at the DKIM settings on the O365 security settings. In it, there is an "enable/disable" switch. Ours was off and we couldn't switch it to Enable. However it gave a text box.
    The MS engineer got us to copy the text, and we had to visit our Domain host (Go Daddy for us). And, in their DNS Management / DNS Records settings, under Cname settings, we had to enter some new components twice.
    Your support engineer will take you through this.

    Hope this helps you.

    Cheers,

    1 person found this answer helpful.
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  4. Anonymous
    2023-09-21T03:31:32+00:00

    Assuming you're managing an organization using Exchange Online what worked for me was to create a Connector in the Exchange Admin Center that goes O365 to Partner Org. Enter the affected domains (*.gmail.com and any G Suite domains your folks want to send messages to), select "Route email messages through these smart hosts" and give a few IPv4 Google SMTP server IPs. You can find some IPs by typing nslookup -type=mx gmail.com and then look up the IPs for some of the mail exchangers listed (for example, nslookup gmail-smtp-in.l.google.com).

    This problem ended up being solved outside of our company, but this worked reliably to get messages from our org to G Suite/Gmail domains.

    1 person found this answer helpful.
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  5. Anonymous
    2023-02-24T05:31:14+00:00

    Hi, Clear View Exteriors

    Good day!

    Thank you for posting to Microsoft Community. We are happy to assist you.

    According to your description, the issue of your concern that you've got an error for 550 5.7.350.

    (We've already removed your detailed account information from the above sine it is sensitive to share the private account information in our community. This is for protecting your privacy and account safety, thanks for your understanding. )

    The details shows that message is likely suspicious due to the very low reputation of the;sending domain, at this moment, it is best for you to contact Microsoft Online tech support team which saving for your time. Our Online tech support team has higher permission and able to access into the back end from server. They would able to either improve the reputation or give you a workaround (use subdomain).

    Please be kindly to contact your administrator and refers below steps:

    1. Go to the admin center at https://admin.microsoft.com. (This is only for administrator's account.)
    2. On the bottom right side of the page, select Help & support.
    3. Type a question or keyword into the text box. If you get a drop-down list, select the one closest to your question, or continue typing your question, then press Enter.
    4. If the results don't help, at the bottom, select Contact Support.
    5. Enter a description of your issue, confirm your contact number and email address, select your preferred contact method, and then select Contact me. The expected wait time is indicated in the Contact support pane.

    Thanks for your precious time and your understanding would be highly appreciated.

    Have a nice day,

    Alex | Microsoft Community Moderator.

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