The fastest way to block spam on iPhone

iPhone's Mail app has a built-in spam filter that catches most junk before it reaches your inbox. To turn it on, open Settings, tap Mail, scroll down to Threading, and look for the "Filter Unknown Senders" toggle. When this is on, messages from people not in your contacts go to a separate Unknown Senders tab instead of your main inbox.

This single setting stops roughly 80 percent of spam from cluttering your inbox without you having to do anything else. Unknown Senders stays organized by sender, so you can scan it quickly if you're waiting for a message from someone new. The filter doesn't delete anything — it just moves it out of the way.

If you use Gmail, Outlook, or another email service through the Mail app, that service's own spam filters run first, then iPhone's filter runs second. This layering means you get protection from both places at once.

Key Takeaways

  • Turn on "Filter Unknown Senders" in Settings > Mail to move messages from non-contacts into a separate tab instead of your main inbox.
  • Mark spam as junk in the Mail app by swiping left on a message and tapping the trash icon, which trains your email provider's filter.
  • Unsubscribe from legitimate marketing emails using the unsubscribe link at the bottom of the message — this stops most repeat senders faster than marking as spam.
  • Create email rules in Gmail, Outlook, or Yahoo to automatically sort or delete messages matching certain words or sender addresses.
  • Never reply to spam, click links in suspicious emails, or confirm your email address is real, as this tells spammers your address is active.

Mark individual messages as junk

When a spam message lands in your inbox despite the filter, swipe left on it and tap the trash icon. This deletes the message and tells your email provider (Gmail, Outlook, Yahoo, or whoever runs your account) that this sender is spam. Over time, your provider learns which senders to block automatically.

If you're using the Mail app with a Gmail account, marking as spam in Mail also marks it as spam in Gmail itself. The same is true for Outlook and Yahoo. This means the action counts toward blocking that sender across all your devices.

Do this consistently for the same senders. After you mark three or four messages from the same address as spam, most providers stop delivering their mail to you entirely.

Unsubscribe from marketing emails you no longer want

Legitimate marketing emails — from stores, newsletters, or services you signed up for — include an unsubscribe link at the very bottom of the message. Tap it. This removes you from that sender's mailing list and usually takes effect within a few days.

Unsubscribing works faster than marking as spam for these senders because you're telling them directly to stop, not just training a filter. Real companies honor unsubscribe requests because email laws require them to. Spammers ignore unsubscribe links, so if clicking it does nothing, that's a sign the email is actually spam and you should mark it as junk instead.

If an email doesn't have an unsubscribe link at the bottom, it's almost certainly spam. Mark it as junk and move on.

Create rules in Gmail, Outlook, or Yahoo to sort or delete automatically

If you use Gmail through the Mail app, you can create filters that automatically sort or delete messages. Open Gmail in a web browser on your computer, click the Settings gear icon, select "See all settings," then go to the Filters and Blocked Addresses tab. Click "Create a new filter" and enter a sender address or keyword you want to block.

Outlook and Yahoo have similar tools. In Outlook, go to Settings > Mail > Rules, then create a rule that moves messages from a specific sender to Deleted Items or another folder. In Yahoo Mail, go to Settings > Filters and create a filter by sender address or subject line.

Rules are useful when you keep getting mail from the same address or domain (like all messages containing "click here now" in the subject). Once you set a rule, it applies to all future messages matching that pattern without you having to touch them.

What not to do when you see spam

Never reply to a spam email, even to ask them to stop. A reply tells the sender your email address is real and monitored, which makes you a more valuable target. They may sell your address to other spammers or send you more mail themselves.

Do not click links or read attachments from suspicious emails. Clicking a link can confirm your address is active, and attachments may contain malware. If you're unsure whether an email is real, go directly to the company's website by typing the address into your browser instead of clicking the email's link.

Do not enter your email address on websites you don't trust, especially pop-ups or forms that seem designed to collect addresses. Spammers buy these lists in bulk. If you must enter your email somewhere, use a temporary email service like Temp Mail or 10 Minute Mail instead of your real address.

Use a separate email address for shopping and signups

Create a second email address specifically for online shopping, newsletter signups, and websites that ask for your email. Keep your main email address for people you actually know and services you use regularly. This way, spam to your secondary address doesn't clutter the inbox that matters.

Gmail makes this straightforward: if your address is yourname@gmail.com, you can use yourname+shopping@gmail.com or yourname+newsletters@gmail.com. All mail goes to the same account, but you can see which service sold or leaked your address by looking at what came after the plus sign. You can then create a rule to delete everything sent to that variant.

Yahoo and Outlook don't support the plus-sign trick, but both let you create alias addresses that forward to your main inbox. Use these aliases for signups instead of your primary address.

Check your email provider's spam folder settings

Sometimes legitimate emails end up in your spam folder by mistake. Check your spam folder once a week, especially if you're waiting for a password reset, shipping notification, or other important message. If you find something that shouldn't be there, open it and tap "Not Spam" or "Report Not Spam" — this trains your provider to deliver similar messages to your inbox in the future.

In Gmail, go to the Spam folder, find the message, open it, and click the three-dot menu, then "Report not spam." In Outlook, right-click the message and select "Mark as not junk." In Yahoo, click the message and select "Not spam."

If a sender keeps landing in spam, add them to your contacts. Email providers treat messages from people in your address book as trusted and deliver them to your inbox automatically.

Frequently Asked Questions

Does turning on "Filter Unknown Senders" mean I'll miss important emails?

You might miss emails from people you don't know yet, like a recruiter or a new service you signed up for. Check the Unknown Senders tab occasionally, especially if you're expecting contact from someone new. Once you add them to your contacts, their future emails go straight to your inbox.

Can I block a specific sender completely?

Yes. Open the message from that sender, tap the sender's name at the top, then scroll down and tap "Block This Contact." All future emails from that address will go to spam automatically. You can unblock them later by going to Settings > Mail > VIP and scrolling to the bottom.

What if spam keeps coming even after I mark it as junk?

Spammers often use a new sender address for each batch of mail, so marking one message as spam doesn't stop all of them. If you notice a pattern — like all spam contains the same word in the subject line — create a rule to catch that pattern instead. Rules are more effective against organized spam campaigns than marking individual messages.

Is it safe to click "unsubscribe" on emails I don't recognize?

Unsubscribe links on legitimate marketing emails are safe. Real companies use them because the law requires it. However, if an email looks suspicious or you have no memory of signing up, mark it as spam instead. Spammers rarely include real unsubscribe links, so clicking one won't hurt, but marking as spam is the safer choice.

Can I recover emails I accidentally marked as spam?

Yes. Go to your spam or junk folder, find the message, and tap "Not Spam" or "Report Not Spam" depending on your email provider. The message moves back to your inbox. You can also add the sender to your contacts to prevent future emails from them being filtered.