The fastest way to block spam on iPhone

Open the email message you want to block. Tap the flag icon or the three dots menu (depending on which email app you use), then select Block Sender or Move to Junk. The sender's future emails will go straight to your Junk folder automatically. This works in Apple Mail, Gmail, Outlook, and most other email apps on iPhone.

If you use Apple Mail, you can also swipe left on an email in your inbox and tap the trash icon, then tap Mark as Junk. Apple learns from your choices and filters similar messages on its own over time. The more you mark as junk, the better the filter becomes at catching spam before it reaches your inbox.

For emails already in your Junk folder, you do not need to do anything — they stay there unless you move them back. If a legitimate sender ends up in Junk by mistake, open the message and tap Not Junk to move it back to your inbox and train the filter to recognize that sender as safe.

Key Takeaways

  • Blocking a sender in Apple Mail, Gmail, or Outlook takes one tap and sends all their future emails to Junk automatically.
  • Marking emails as junk teaches your iPhone's filter to catch similar messages, so the more you do it, the fewer spam emails you see.
  • If a real sender lands in Junk by mistake, tap Not Junk to move them back and prevent it from happening again.
  • Some email providers let you create rules that automatically delete or sort emails from certain addresses or with certain words in the subject line.
  • Unsubscribe links at the bottom of marketing emails actually work and are often faster than blocking if you want to stop hearing from a legitimate business.

How to set up automatic rules in Gmail

Gmail's filter system is more powerful than Apple Mail's basic block feature. Open any email from a sender you want to block, tap the three dots menu, and select Filter messages like this. Gmail will show you options: you can filter by sender address, subject line, or words in the message body.

Choose what you want to filter on, then tap Create filter. On the next screen, select Delete to send matching emails straight to trash, or Skip the Inbox to send them to a label you create. You can also check Mark as read so filtered emails do not show as unread notifications. Tap Create filter again to save your rule.

This approach works well when you get repeated spam from the same sender or emails with the same subject line pattern. Once the filter is set, you will not see those messages in your inbox at all — they go directly to the folder you chose.

How to set up automatic rules in Outlook

Outlook on iPhone has a simpler rule system than Gmail. Open an email from a sender you want to block, tap the three dots menu, and select Junk or Block. This moves the email to Junk and blocks the sender when ready.

For more control, go to your Outlook settings (the gear icon), tap Mail, then Junk Email. Here you can add specific email addresses to your Blocked Senders list manually, or view addresses you have already blocked. You can also adjust how aggressive Outlook's spam filter is — Standard catches most spam, while Strict is more aggressive but may catch legitimate emails by mistake.

Unlike Gmail filters, Outlook does not let you create rules based on subject lines or message content on the iPhone app itself. If you need that level of control, you can set up rules on Outlook's website using a computer, and they will explore to your iPhone as well.

Unsubscribe links and why they matter

Many spam emails are actually marketing messages from real businesses — newsletters, promotional offers, or account notifications you signed up for at some point. These are not the same as phishing scams or malware, and blocking them is not always the best first step.

Look for an Unsubscribe link at the very bottom of the email. Tapping it removes you from that sender's mailing list permanently and usually takes effect within a few days. This is faster and more reliable than blocking, because the sender stops sending you emails rather than your filter catching them.

Unsubscribe links are required by law for marketing emails in most countries, so they are safe to use. If an email does not have an unsubscribe link and claims to be from a real company, that is a sign it might be a phishing attempt — in that case, block or delete it instead.

What to do about phishing and scam emails

Phishing emails pretend to be from your bank, Apple, PayPal, or another service you use, and ask you to click a link or enter your password. These are dangerous and should be handled differently than regular spam.

Do not click any links in a phishing email. Instead, block the sender, then report the email to the real company it claims to be from. In Apple Mail, tap the three dots menu and select Report Junk. In Gmail, tap the three dots and select Report phishing. In Outlook, tap the three dots and select Report. These reports help the email provider and the company being impersonated improve their defenses.

If you accidentally clicked a link or entered information, change your password for that account when ready using a computer or a different device. Contact the real company's support line (use the number on their official website, not any number in the email) to report the incident.

Why spam keeps coming and how to reduce it

Spam increases when your email address is sold to marketing lists, posted publicly online, or guessed by automated systems. You cannot stop all spam, but you can reduce how much you receive by being careful where you share your email address.

When you sign up for a website or service, look for a checkbox that says something like Send me promotional emails or I agree to receive marketing. Uncheck it if you do not want to hear from them. Many websites pre-check these boxes, so you have to actively uncheck them.

If you have an old email address that receives a lot of spam, consider creating a new one for important accounts (banking, work, personal contacts) and keeping the old one for shopping and signups. This way, spam to the old address does not clutter your main inbox. You can still check it occasionally for legitimate messages you might need.

Frequently Asked Questions

Does blocking a sender on iPhone delete their old emails?

No. Blocking only stops future emails from that sender. Old messages stay in your inbox unless you delete them manually. If you want to remove them, open your inbox, find the emails from that sender, and swipe left to delete them one by one, or select multiple and delete them together.

Can I block an email address that keeps changing?

If the sender uses a different address each time, blocking individual addresses will not stop them all. Instead, look for a pattern — do they all come from the same domain (the part after the @)? In Gmail, you can create a filter for anything from that domain. If there is no pattern, mark each one as junk and let your filter learn over time.

What is the difference between blocking and marking as junk?

Blocking a sender prevents their emails from reaching your inbox and usually prevents them from seeing read receipts. Marking as junk moves the email to your Junk folder but does not block the sender — their next email will still arrive in your inbox unless you block them separately. Blocking is stronger.

Will the sender know I blocked them?

No. Blocking only affects what you see on your device. The sender will not receive a notification that you blocked them. If they send you an email, it will go to your Junk folder, and you will not see a notification about it.

Can I unblock a sender if I change my mind?

Yes. In Apple Mail, go to Settings > Mail > Blocked, and swipe left on the sender's name to unblock them. In Gmail, open Settings > Filters and Blocked Addresses, find the filter, and delete it. In Outlook, go to Settings > Junk Email > Blocked Senders, and swipe left to remove them. After unblocking, their emails will arrive in your inbox normally again.