Error sending emails to gmail accounts

Question

I am having issues sending emails to people with gmail accounts. They are coming back with error and not able to send. This started happening about a week ago.

Answer 1

Here is the information, I just tried replying to this email today and it kick it back. Let me know if you need more of the error message. I have tried both Edge and Chrome to open Outlook in and it is still not working,

All of the issues are with gmail accounts.
@msn.com
Yes, I can send find to all other emails
I cannot get any gmail emails to complete and deliver. All are coming back.

Diagnostic information for administrators:

Generating server: PH8PR12MB7205.namprd12.prod.outlook.com Remote server returned '554 5.7.0 < #5.7.520 smtp;550 5.7.520 Message blocked because it contains content identified as spam. AS(4810)>'

Answer 2

Sorry to hear you are having trouble with this. Could you please share the complete error message from the returned email, especially the code and the section labeled Diagnostic information for administrators? Please remove any personal email addresses.

Also, please confirm:

• Does this happen with every Gmail address or only certain recipients?
• Does your sending address end in @outlook.com, @hotmail.com, or a third-party/custom domain?
• Can you send successfully to non-Gmail addresses?
• Does a new plain-text message without links, signatures, or attachments also fail?

The exact rejection code is essential because Gmail uses different codes for temporary server problems, spam filtering, sender reputation, and email-authentication failures.