How do fix this

Question

Your message to ******@gmail.com couldn't be delivered.

A custom mail flow rule created by an admin at sfcollegeedu.onmicrosoft.com has blocked your message.

Account not authorized to send

emmypolite.john Office 365 gmail.com

Sender Action Required

Blocked by mail flow rule.

How to Fix It

An email admin at sfcollegeedu.onmicrosoft.com has created a custom mail flow rule that blocks messages that meet certain conditions, and it appears that your message has met one or more of those conditions.

Check the text above for a custom message from the email admin that may help explain why your message was blocked and how you might be able to fix it. For example, removing prohibited words from the message or sending the message from a different email account may be sufficient to deliver your message.

If you've tried and you're still not able to fix the problem, consider contacting the email admin at sfcollegeedu.onmicrosoft.com to discuss what to do. While they're unlikely to remove or relax the rule, if you have a legitimate need to deliver your message they may offer guidance for how to do so.

More Info for Email Admins

Status code: 550 5.7.1_ETR

This error occurs because an email admin at sfcollegeedu.onmicrosoft.com has created a custom mail flow rule that has blocked the sender's message.

In some cases, the sender can change the message so it no longer violates the rule. However, depending on the rule's conditions, it's possible that the only way to deliver the message is to change the rule itself, and only an email admin at sfcollegeedu.onmicrosoft.com can do that. Although it's possible the rule is unintentionally flawed or it's stricter than the admin intended, it may be working exactly as they want it to.

Original Message Details

Created Date: 20/05/2023 05:37:28

Sender Address: ******@xx.xxx.edu

Recipient Address: ******@gmail.com

Subject: Love

Error Details

[PII removed by Microsoft Moderator for your privacy]

Answer 1

I’m sorry to hear that your message was blocked by a custom mail flow rule created by an admin at sfcollegeedu.onmicrosoft.com. This means that the recipient’s organization has set up some criteria to filter out certain emails, and your message did not meet those criteria. This is not something that I can fix for you, as I have no control over the recipient’s mail settings. However, I can help you write a polite email to the recipient, explaining your situation and asking them to whitelist your email address or adjust their mail flow rule. Here is a possible email you can use:

Subject: Request to unblock my email address

Hello,

I am writing to you because I recently tried to send you an email, but it was blocked by a custom mail flow rule created by an admin at sfcollegeedu.onmicrosoft.com. The error message I received was: “Account not authorized to send”.

I am not sure why my email was blocked, as I have not done anything wrong or violated any rules. I am a legitimate sender who has a valid reason to contact you. Could you please check your mail flow settings and see if there is a way to unblock my email address or allow my message to go through? I would really appreciate your help with this issue.

Please reply to this email and let me know if you have received it and if you can assist me with resolving the problem. Thank you for your time and attention.

Sincerely, Cynthia Murray

Answer 2

Dear Emmypolite John,

Good day! Thank you for posting to Microsoft Community. We are happy to help you.

Based on your description, I understand that you have a query "How do fix this." Before we proceed, we need more detailed information about the situation you are experiencing.

From Microsoft official article, this error indicates that a security policy in your or the recipient's organization is preventing your message from reaching the recipient. You may not have permission to send to the recipient; the recipient is a group, and you do not have permission to send to the group or one of its subgroups; you do not have permission to send email through an email server that is between you and the recipient; or your message was routed to the incorrect email server. Refer to Fix NDR error 550 5.7.1 in Exchange Online - Exchange | Microsoft Learn

As the NDR says "An email admin at xxxx.onmicrosoft.com has created a custom mail flow rule that blocks messages that meet certain conditions, and it appears that your message has met one or more of those conditions", have you contacted the recipient admins to confirm if they have a policy that is blocking your emails?

We look forward to hearing from you; Please understand that our initial reply may not always immediately resolve the issue. However, with your help and more detailed information, we can work together to find a solution. Thank you for your cooperation.

Sincerely,

De Paul | Microsoft Community Moderator