The following organization rejected your message: mx.google.com

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The following organization rejected your message: mx.google.com

John Bean 0

[Moved from Microsoft 365 and Office]

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Answer 1

Victor1-V 8,905 Microsoft External Staff Moderator

Hello John Bean,

Welcome to the Microsoft Q&A forum.

I understand how confusing it is to see your message rejected when Outlook.com appears to send mail successfully.

The message “The following organization rejected your message: mx.google.com” indicates that the email was refused by Google’s mail servers, not by Outlook.com. In other words, the delivery attempt reached Google, where it was rejected during their inbound mail checks.

Before going further, I’d like to add some important context and checks that usually help identify the reason:

1, Review the full bounce / rejection message

If you received a non‑delivery report (NDR), please open it and check for additional details such as:

Error codes (for example, 550, 421, or policy‑related messages)
Text mentioning spam, policy, authentication, or invalid recipient

Those details explain why Google rejected the message.

2, Confirm the recipient address

Make sure the Gmail address is typed correctly and that the recipient’s mailbox still exists and can receive mail from other senders.

3, Check whether messages to Gmail worked before

If this started recently, it may be related to Google’s spam or security filters temporarily blocking messages from your address.

4, If you’re sending from a custom domain

Rejections from Gmail often occur when SPF, DKIM, or DMARC records are missing or misconfigured on the sender’s domain. This would need to be reviewed on the domain’s DNS side.

Since the rejection is coming from Google’s servers, Microsoft community forum agents don’t have visibility into Gmail’s filtering decisions or the ability to release the message on their side.

If you can share the exact error text from the bounce message (without personal addresses), it will help clarify whether this is a recipient issue, a policy block, or an authentication‑related rejection.

I hope this helps clarify what the message means and how to narrow down the cause.

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

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John Bean 0 Reputation points

2026-02-02T00:17:50.97+00:00

this is what I got with the error message.

mx.google.com Remote server returned '554 5.7.0 <mx.google.com #5.7.26 smtp;550-5.7.26 Your email has been blocked because the sender is unauthenticated. 550-5.7.26 Gmail requires all senders to authenticate with either SPF or DKIM. 550-5.7.26 Authentication results: 550-5.7.26 DKIM = did not pass 550-5.7.26 SPF [johnjbeancpa.com] with ip: [Moderator note: PII removed] = did not 550-5.7.26 pass 550-5.7.26 For instructions on setting up authentication, go to 550 5.7.26 https://support.google.com/mail/answer/81126#authentication
[Moderator note: PII removed]
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Victor1-V 8,905 Reputation points Microsoft External Staff Moderator

2026-02-02T13:24:46.56+00:00
Hello John Bean,

Thank you for sharing the full rejection details - that helps clarify the situation.

Based on the error message, Gmail rejected the email because the sending domain johnjbeancpa.com is not authenticated. This means the message did leave Outlook.com successfully, but Google blocked it during their security checks.

In simple terms, this is what’s happening:

You’re sending email from a custom domain address (for example, @johnjbeancpa.com) using Outlook.com.

Gmail checks whether that domain has proper email authentication set up.

Google requires at least SPF or DKIM to pass.

In your case, Gmail reports:

DKIM: did not pass

SPF: did not pass

Because neither passed, Gmail treated the message as unauthenticated and rejected it with error 554 5.7.26.

This isn’t something that can be fixed inside Outlook.com itself. The correction needs to be made on the DNS settings for the domain johnjbeancpa.com, where the domain is hosted (for example, your domain registrar or DNS provider).

What typically needs to be done:

Update the domain’s SPF record to authorize Microsoft’s mail servers to send email for johnjbeancpa.com.

Enable and configure DKIM for the domain (if your DNS provider supports it).

After changes are saved, allow time for DNS changes to propagate, then try sending again.

Google’s own guidance linked in the error message explains their requirement, and it matches what you’re seeing.

Once the domain authentication is correctly configured, Gmail should accept messages sent from your Outlook.com account using that custom domain.

I hope this clearly explains why the message was rejected and where the fix needs to be applied.
Victor1-V 8,905 Reputation points Microsoft External Staff Moderator

2026-02-03T12:28:28.6533333+00:00

Hello John Bean,

I am following up to check whether you have had an opportunity to review the response provided and try the suggested steps.

Please feel free let me know if you need any further assistance. I remain available to assist you further.

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The following organization rejected your message: mx.google.com

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