554 6.6.0 Error message when sending emails thru outlook only// Help please

Question

When sending emails thru outlook I get 554 6.6.0 Error/ If I send direct thru web my gmail account or aol all works fine no bounce back.Just started this issue today after we had an internet down in our area for few hours.

Answer 1

The error message "554 6.6.0" typically indicates that there is an issue with the content of the email being sent, which may be related to transport rules or the email's formatting. Since you mentioned that the problem started after an internet outage, it could also be related to connectivity issues or settings that were altered during the downtime.

Here are some steps you can take to troubleshoot this issue:

1. Check Transport Rules: If there are any transport rules set up in your email system, ensure that they are not causing the message to be deferred or blocked. You may want to review and modify any rules that could be affecting email delivery.
2. Test with Different Content: Try sending a simple email without attachments or special formatting to see if it goes through. If it does, the issue may be with the content of your original email.
3. Repair Outlook: Sometimes, repairing the Outlook application can resolve underlying issues. You can do this through the Control Panel under Programs and Features.
4. Check Email Account Settings: Ensure that your email account settings in Outlook are correct, especially after the internet outage. Sometimes, settings can revert or change unexpectedly.
5. Contact Support: If the issue persists, consider reaching out to your email service provider or Microsoft support for further assistance.

These steps should help you diagnose and potentially resolve the error you're encountering when sending emails through Outlook.

Answer 2

Hello

Can you please try switching it to plain texts or rich texts, avoid using HTML. Follow the instruction here to switch: https://support.microsoft.com/en-us/office/change-the-message-format-to-html-rich-text-format-or-plain-text-in-outlook-338a389d-11da-47fe-b693-cf41f792fefa#picktab=classic_outlook

See if that helps.