Outlook.com Emails Going to Spam

Applies to: Outlook.com, Hotmail, Microsoft 365 personal accounts

This one splits two ways — mail landing in your Junk folder, or mail you send landing in someone else's. Worth knowing which one you're dealing with before you start.

Problem A: Other people's emails land in your Junk folder

1. Open the message in Junk → click Not junk at the top.
2. Add the sender to Safe senders: Settings → Mail → Junk email → add their address under Safe senders and domains.
3. If everything from one provider suddenly stops arriving — Gmail in particular — check your Blocked Senders list too. Blocking a single person's Gmail address can sometimes end up blocking the whole gmail.com domain if it was added incorrectly, which silently kills mail from everyone on Gmail, not just the one sender you meant to block.
4. If entire newsletters keep getting filtered, add the whole sending domain rather than one address at a time.

Problem B: Emails you send land in other people's spam

This is a deliverability issue, not something in your Outlook.com settings, and it usually comes down to one of these:

1. Sending bulk or repetitive messages from a personal account — Microsoft's filters flag high-volume patterns even from genuine accounts. Use an actual mailing tool for newsletters instead.
2. Sending from a custom domain without SPF/DKIM/DMARC set up — if you're sending "as" a business address through Outlook, your domain's DNS needs those authentication records pointing at Microsoft's servers.
3. Content that reads as spammy — too many links, ALL CAPS subject lines, urgent language like "ACT NOW." Trips filters even when the sender's completely legitimate.

Check your sender reputation

1. Ask the recipient to check Junk and mark your message "Not junk" — this genuinely helps train the filter for next time.
2. If you manage the sending domain, look up its actual reputation with Microsoft's Smart Network Data Services (SNDS) rather than guessing.