How did I get identified as spam

Hi Mike Petrofes

I understand you are having a problem with Outlook.com flagging or blocking your outgoing mail as spam. I am happy to help. Could you please confirm:

• What is the exact bounce/NDR text or error code when sending (for example, lines containing “550 5.7.x”)?
• Does it happen only in Outlook.com on the web, or also in Outlook mobile/desktop?
• Does it occur only when sending to many recipients, or only when messages include links/attachments?

I would love to hear from you soon. Have a lovely day!

Outbound mail being blocked as spam on Outlook.com or Outlook on the web cannot be fully diagnosed or reversed from the client side; it is controlled by Microsoft’s service-side protection systems. The provided information explains how to manage junk mail you receive, but not why an account is flagged for sending spam or how to remove such a block.

For incoming spam, the following actions are supported:

1. Use the Junk Email features so spam is filtered correctly instead of reaching the Inbox:
   • In Outlook on the web/Outlook.com:
     1. Select Settings > Mail > Junk email.
     2. Add unwanted addresses or domains under Blocked senders / Blocked domains.
     3. Select Save.
   • Alternatively, right‑click a message and choose Block > Block Sender so future messages from that sender go directly to Junk Email or quarantine.
2. Periodically review the Junk Email folder to ensure legitimate messages are not misclassified, and adjust Safe Senders and Blocked senders lists accordingly.
3. To improve spam handling overall, use Outlook’s built‑in protections and recommendations such as:
   • Rely on the Junk E‑mail Filter so suspected spam is moved to Junk E‑mail automatically.
   • Avoid actions that confirm address validity to spammers (for example, loading external images in suspicious messages or responding to unsolicited read receipts).

If outbound mail is currently blocked as spam, the only supported next step in the provided material is to contact Outlook.com support directly from within the service and work with support to review and restore mail flow:

1. Sign in to Outlook.com.
2. Select Help (or ?) in the menu bar.
3. Enter the issue (for example, “outgoing email blocked as spam”) and follow the prompts.
4. If self‑help does not resolve the issue, scroll to Still need help? and choose the option to contact support.

The context does not provide specific reasons or remediation steps for why a particular account’s outgoing mail is classified as spam, only that such issues are sometimes known service‑side problems that must be handled by Microsoft support.

References:

• Filter junk email and spam in Outlook
• 10 tips on how to help reduce spam
• Block a mail sender in Outlook
• Mail goes to the Junk folder by mistake
• Block or unblock senders in Outlook
• Outlook.com doesn't send any emails to junk folder - Microsoft Q&A
• Outgoing emails with attachments undelivered as spam - Microsoft Q&A
• How to Fix outlook - Microsoft Q&A
• Stopped receiving emails on my account. - Microsoft Q&A
• Receiving unsolicited OneDrive File/Folder shares, how do I stop it? - Microsoft Q&A