Best Email Spam Blocker Options After Spam Arrest (2026)

Spam still clogs inboxes in 2026, so an email spam blocker is worth setting up properly. Back in 2005 we bumped into Spam Arrest when an email we sent to a friend bounced back with a challenge: type the word in this image to prove you’re human. It was a clever idea, but Spam Arrest ceased all operations on 30 November 2024. Here’s what works better today.

Quick answer: The best email spam blocker is usually the filter already built into Gmail, Outlook, Yahoo Mail or Apple Mail. Mark junk as spam (don’t just delete it), block repeat senders, unsubscribe from legitimate lists, and use email aliases for sign-ups. For more control, add a filtering service or a privacy-focused provider with alias features.

What was Spam Arrest?

Spam Arrest used a “challenge-response” system. Emails from unknown senders got an automatic reply asking them to verify themselves by typing a word from an image. Once verified, they were added to your approved list. Unverified mail waited in a separate folder and was deleted after 7 days.

Even in 2005 we weren’t sure about challenging every unknown sender: many genuine contacts don’t understand why their email bounced and simply don’t bother replying. Challenge-response also sends replies to forged sender addresses, which creates its own junk mail. That’s one reason the approach faded.

How to block spam in popular email apps

• Gmail: open the message and click Report spam; use the three-dot menu to Block a sender. Create filters (search options > Create filter) to auto-delete or label specific senders.
• Outlook: select the message and choose Report > Report junk, or Block sender. Manage Safe and Blocked senders in Settings > Mail > Junk email.
• Yahoo Mail: select the message and click Spam; add blocked addresses in Settings > More Settings > Security and Privacy.
• Apple Mail / iCloud: move junk to the Junk folder to train the filter, and block senders from the message header.

Habits that cut spam

• Report, don’t delete: reporting trains your provider’s filter.
• Unsubscribe from newsletters you signed up for; use the unsubscribe link in your email app rather than replying.
• Don’t reply to obvious spam or click its links; that confirms your address is active.
• Use aliases: Gmail’s plus addressing (you+shop@gmail.com), iCloud Hide My Email or Firefox Relay give each site its own address you can turn off.
• Keep your main address off public pages; use a contact form on your website.

Extra spam protection tools

• Email alias services such as SimpleLogin and Firefox Relay forward mail and let you disable an alias that starts getting spam.
• Privacy-focused providers like Proton Mail include strong filtering and aliases.
• For businesses, Google Workspace and Microsoft 365 include advanced spam and phishing protection, and dedicated gateways add more control.

If spam or phishing already got through, our guide to the most common passwords explains how to secure your accounts.

FAQ

Does Spam Arrest still work?

No. Spam Arrest ceased all operations on 30 November 2024.

What is the best free email spam blocker?

Gmail and Outlook’s built-in filters are excellent and free. Combine them with aliases for sign-ups.

Why do I still get spam after blocking senders?

Spammers change addresses constantly. Reporting messages as spam trains the filter better than blocking alone.