How to solve receiving a huge number of spam emails every day?

To reduce the volume of spam and avoid missing important messages in new Outlook for Windows and Outlook.com/Outlook on the web, adjust junk settings and use safe/blocked lists effectively.

1. Use and tune the Junk Email filter

• In Outlook (classic) the Junk Email Filter can be made more aggressive:
  1. Select Home > in the Delete group select Block > Junk E-mail Options.
  2. On Options, choose a higher level:
     • Low – filters obvious junk.
     • High – filters more junk; check the Junk E-mail folder regularly for mistakes.
     • Safe Lists Only – only mail from Safe Senders/Safe Recipients is treated as not junk.
• You can also enable Permanently delete suspected junk email instead of moving it to the Junk E-mail folder if reviewing junk is not important, but this risks losing legitimate mail.

2. Adjust junk handling in Outlook.com / Outlook on the web If using Outlook.com or Outlook on the web behind new Outlook for Windows:
3. At the top of the screen, select Settings > Mail.
4. Under Options, select Block or allow or Junk email (depending on view).
5. Ensure Automatically filter junk email is selected so the service-side filter is active.
6. Use Incoming mail handling (Standard/Strict) if available. If junk is not being filtered correctly, one proven workaround is:
   • Set handling to Strict, save, sign out.
   • Sign back in, set it back to Standard, save.
   • Wait a few hours for filtering behavior to improve.
7. Maintain Safe Senders and Safe Recipients To avoid losing important messages in Junk:
8. Go to Settings > Mail > Junk email or Block or allow.
9. Under Safe Senders and Recipients:
   • Add email addresses and domains that should never go to Junk.
   • Optionally enable Trust email from my contacts so anything from Contacts is treated as safe. This helps ensure important senders bypass the junk filter even when protection is set to High/Strict.
10. Use Blocked Senders and domains for persistent spam
11. Go to Settings > Mail > Junk email.
12. Under Blocked senders and Blocked domains:
    • Add addresses or domains that repeatedly send spam.
    • Messages from these will go directly to Junk.
13. If spam is extreme, consider Don’t trust email unless it comes from someone in my Safe Senders and Recipients list or local senders (very restrictive; review carefully so you do not miss legitimate mail).
14. Leverage Outlook’s built-in anti-spam protections

• Outlook includes a Junk E-mail Filter that automatically evaluates incoming messages and moves suspected spam to the Junk E-mail folder.
• It also blocks automatic picture downloads and other external content that spammers use as web beacons. Leave this enabled so opening a spam message does not confirm that the address is valid.

6. General practices to reduce future spam

• Avoid responding to spam, including read receipts or meeting requests from unknown senders, as this can confirm the address.
• Do not disable junk filtering entirely (Don’t move email to my Junk Email folder) because then spam classified by the service will land in the Inbox.

By combining: (1) a higher junk protection level, (2) Safe Senders/Contacts for important mail, and (3) Blocked Senders/domains for recurring spam, the volume of spam in Junk should remain high (which is expected) while the risk of important messages being misclassified is reduced.

References:

• 10 tips on how to help reduce spam
• Block or allow (junk email settings)
• Change the level of protection in the Junk Email Filter in Outlook
• Block or unblock senders in Outlook
• Outlook.com doesn't send any emails to junk folder - Microsoft Q&A