Outgoing mails are not delivering

Question

A P 0

Hello Team,

I've been trying to apply for jobs by responding to LinkedIn posts as well as cold outreach mails but these are not getting delievered.

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)>'

Pls remove the restrictions as it's hampering my chance of delivering the CV/assignments on time.

Gabe Bratton 601 Reputation points Microsoft Employee Moderator

2026-01-22T14:46:00.21+00:00

The consumer support team escalated this issue to the Outlook Team and they say they have reverted the change that caused it. It might take a few hours to stop occurring.
A P 0 Reputation points

2026-01-29T12:41:35.2933333+00:00

The issue has again started surfacing. Pls remove my mail from spam list.
Gabe Bratton 601 Reputation points Microsoft Employee Moderator

2026-01-29T18:07:01.6633333+00:00

The consumer team says to open a support ticket, https://support.microsoft.com/en-us/contactus#!. They need to collect a sample of the NDR (non-delivery report) or the email message. I expect they want to see the email with the NDR. I added this forum report to the original internal incident so they have it for reference.

2 answers

Gabe Bratton 601 Reputation points Microsoft Employee Moderator

2026-01-22T14:46:00.21+00:00

The consumer support team escalated this issue to the Outlook Team and they say they have reverted the change that caused it. It might take a few hours to stop occurring.
A P 0 Reputation points

2026-01-29T12:41:35.2933333+00:00

The issue has again started surfacing. Pls remove my mail from spam list.
Gabe Bratton 601 Reputation points Microsoft Employee Moderator

2026-01-29T18:07:01.6633333+00:00

The consumer team says to open a support ticket, https://support.microsoft.com/en-us/contactus#!. They need to collect a sample of the NDR (non-delivery report) or the email message. I expect they want to see the email with the NDR. I added this forum report to the original internal incident so they have it for reference.

Answer 1

EmilyS726 203.1K Independent Advisor

Can you use the instruction here, change the email to plain text or rich text format (basically avoid the html format) and see if it goes through:

Answer 2

A P 0

Is microsoft marking my mail as spam?