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mail.protection.outlook.com or prod.protection.outlook.com is rejecting my mail.

Anonymous
2022-07-24T22:44:48+00:00

My mail is leaving my mail server and being received by Outlook / Microsoft customers. It seems my domain is flagged as suspect (intermittently?) simply because it is tiny. There doesn't seems to be a rhyme or reason as I can occasionally deliver to Outlook and O365 addresses. TLS is not required. Free/personal Outlook accounts I don't receive the rejection mail; they just end up in the junk folder for the recipient. The recipient just doesn't receive the mail. For enterprise/business Outlook, I receive the failure message.

My most recent e-mail has the following:

Final-Recipient: rfc822; [e-mail address]
Original-Recipient: rfc822;[e-mail address]
Action: failed
Status: 5.4.1
Remote-MTA: dns; [recipient domain].mail.protection.outlook.com
Diagnostic-Code: smtp; 550 5.4.1 Recipient address rejected: Access denied.

Outlook | Web | Outlook on the web for business | Security

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  1. Anonymous
    2022-07-27T19:41:50+00:00

    "At first, please kindly ask that recipient to add your email in their allow list to see if it makes any difference."

    This is not a viable solution. These are job recruiters that I have never spoken to, so there is not phone number to call to tell them to add me.

    "In addition, please also try to refer to this document to check whether it can help you: Fix email delivery issues for error code 550 5.4.1 in Exchange Online"

    All other domains receive mail. As stated before, even outlook.com domain receives mail as long as the recipient is a free/personal outlook.com e-mail and isn't a business/enterprise MS suite user. I will resend this page to the Soverin.net team but I believe this solution is not applicable.

    "During search, we also found one official document for this NDR error code 550 5.4.1, so here sharing with you. Kindly check details provided in 550 5.4.1 Recipient address rejected: Access denied, if it’s match with yours’ situation."

    The business/enterprise customers I am reaching out to are employment agencies who receive constant contact from new e-mail addresses. While this could be a potential source, it assumes roughly 50% of the agencies I am contacting are actively limiting their ability to receive mail from employees and potential employees.

    "What's your and your recipient's type of account?(business account/outlook.com/imap account/pop account)"

    My account is [mye-mail]@[mydomain.info] which is through soverin.net
    The e-mails I can through to successfully are @outlook.com personal accounts, I just end up in their spam folder.
    The e-mails I cannot get through to successfully are @[business.com] company accounts that are using Microsoft Office Outlook/ O365 Suite in a professional setting. "business" or "enterprise"

    "Whether you got NDR, if so please kindly share complete NDR with me."

    I am definitely willing to, but how do I share it to you privately without publicly doxxing these people's work e-mail addresses?

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  2. Anonymous
    2022-07-25T01:43:19+00:00

    Dear Tsukibara,

    Good day! Thank you for posting to Microsoft Community. We are happy to help you. At first, please kindly ask that recipient to add your email in their allow list to see if it makes any difference. Create safe sender lists in EOP

    In addition, please also try to refer to this document to check whether it can help you: Fix email delivery issues for error code 550 5.4.1 in Exchange Online

    During search, we also found one official document for this NDR error code 550 5.4.1, so here sharing with you. Kindly check details provided in 550 5.4.1 Recipient address rejected: Access denied, if it’s match with yours’ situation.

    If problem persists, I would like to collect more information to do further research:

    What's your and your recipient's type of account?(business account/outlook.com/imap account/pop account)

    Whether you got NDR, if so please kindly share complete NDR with me.

    Your patience and cooperation will be highly appreciated. Hope you all the best!

    Sincerely,

    Kerry Chen | Microsoft Community Moderator

    ***Note: In the event that you're unable to reply to this thread, please ensure that your Email address is verified in the Community Website by clicking on Your Account Name > "My Profile" > "Edit Profile" > Add your Email Address > tick "Receive email notifications" checkbox > click on "Save".***

    4 people found this answer helpful.
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