Email returns

John Anderson Sr 0 Reputation points
2026-06-30T20:48:56.7333333+00:00

Why did I get 27 emails back in my junk acct. Delivery has failed to these recipients or groups:

******@gmail.com Your message wasn't delivered because the destination email system rejected your message for security or policy reasons. For example, the email address might only accept messages from certain senders, or it might not accept certain types of messages, like those larger than a specific size.

Contact the recipient (by phone, for example) and work with them and their email admin to determine what policy or setting blocked your message and what you should do to make sure that future messages from you won't be rejected.

For more information, see Status code 5.7.1.

plus others!!!!

Microsoft 365 and Office | Other
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  1. Jeronimo Fuerte 41,025 Reputation points Independent Advisor
    2026-06-30T21:47:18.45+00:00

    That message means the recipient’s mail provider, for example Gmail in the message you shared, did not accept the email. It does not necessarily mean your Outlook account is broken.

    First, please check your Sent Items folder. If you recognize the 27 emails, try sending again to one recipient at a time, remove large attachments, links, or signatures. If the same recipient keeps rejecting the email, they may need to add you as a safe sender or check with their email provider/admin, because Microsoft cannot force another provider’s server to accept a message.

    If you do not recognize those 27 sent emails, please secure your Microsoft account immediately: change your password, review your recent sign-in activity, check for unknown forwarding or inbox rules, and enable two-step verification. Bounce messages for mail you did not send can indicate that someone accessed your account.

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