Managing personal Outlook.com account settings, security, and privacy
If Outlook.com is returning the message through postmaster and identifying it as spam, the most likely cause is that the message content, sending pattern, or account/IP reputation triggered Outlook.com anti-spam protection.
Try these steps:
- Send a very simple test email to the same recipient.
- Remove emotional or unusual wording.
- Use plain text only.
- Remove links, images, signatures, and attachments.
- Send to one recipient only.
- Reduce anything that looks like bulk sending.
- Do not use many recipients.
- Do not put all recipients in BCC.
- If sending to multiple people, send in smaller batches.
- Check for account or sending reputation issues.
- If many emails were sent recently, wait and try again later.
- New or low-reputation sending patterns can cause deliverability issues.
- If using Outlook with antivirus or security software, check whether email scanning is enabled.
- Look for settings such as Internet Email Auto Protect or Internet Email Protection.
- If enabled, disable that feature and send a test message again.
- Try sending from Outlook.com on the web.
- If it also fails there, that points to an account-level or service-side anti-spam block rather than a local mail app issue.
- Review the recipient address.
- Confirm there are no typos.
- If the message says the address or domain is invalid, correct it and resend.
- If the message is being blocked because of content identified as spam, rewrite it in a neutral, direct format.
- Keep the subject simple.
- State the course application clearly.
- Avoid language that could be interpreted as threatening or abusive.
A safer format is:
Subject: Course Application
Hello,
This message is to apply for your course. Please let me know if any additional information is required.
Regards,
Mr. Andrews
If the problem continues after sending a plain test message from Outlook.com on the web, use Outlook.com support from the Help menu.
References: