The fastest way to stop spam depends on your email provider

Most email providers — Gmail, Outlook, Yahoo Mail, Apple Mail — have a built-in block feature that takes 10 seconds to use. Open the spam message, look for a menu icon (three dots or a downward arrow), and select "Block sender" or "Block this email address". The sender's future messages go straight to spam automatically. This works for individual senders, not for entire categories of spam.

If you receive spam from many different addresses advertising the same thing — say, dozens of weight-loss offers from different domains — blocking individual senders is too slow. In that case, use filters instead. Filters catch emails by keyword, sender domain, or subject line and send them to spam before they hit your inbox. They take a few minutes to set up but handle hundreds of similar messages at once.

The block and filter features exist in every major email service, but the exact steps differ. Gmail and Outlook are the most common, so those are covered in detail below. If you use a different provider, the same logic applies: find the spam message, look for a block or filter option in the menu, and follow the prompts.

Key Takeaways

  • Blocking a sender takes 10 seconds and stops that one address from reaching your inbox, but does not stop similar spam from other addresses.
  • Filters catch multiple messages by keyword or sender domain and send them to spam automatically, which is faster for repeated spam on the same topic.
  • Gmail's block feature is in the three-dot menu on the message; Outlook's is under "Junk" in the toolbar.
  • Unsubscribe links at the bottom of marketing emails are safe to use and remove you from legitimate mailing lists, though they do not work on scam emails.
  • Never reply to spam or click links in suspicious emails, as this confirms your address is active and can increase the spam you receive.

How to block a single sender in Gmail

Open the spam email in Gmail. At the top right of the message, click the three-dot menu icon. A dropdown menu appears with several options. Click "Block [sender's email address]". Gmail will confirm the block and automatically send all future emails from that address to your spam folder.

If you want to unblock a sender later, go to Gmail Settings (the gear icon in the top right corner of your inbox), click "See all settings", then go to the "Filters and Blocked Addresses" tab. Find the blocked address in the list and click "Unblock" next to it.

How to block a single sender in Outlook

Open the spam email in Outlook. In the toolbar at the top, click "Junk" (or "Report" if you are using Outlook on the web). A dropdown menu appears. Select "Block Sender". Outlook will move the current message to your Junk folder and send all future emails from that address there automatically.

To unblock a sender in Outlook, go to Settings (the gear icon), then "View all Outlook settings". Click "Mail", then "Junk email". Under "Blocked senders", you will see a list of blocked addresses. Click the X next to any address to unblock it.

Using filters to catch multiple similar spam messages

If you receive dozens of emails about the same product or service from different senders, blocking each one individually is slow. A filter is faster. Filters automatically send emails to spam based on words in the subject line, sender domain, or message body.

In Gmail, go to Settings, then "Filters and Blocked Addresses", then "Create a new filter". Type a word that appears in all the spam messages you want to catch — for example, "cryptocurrency" or "weight loss". Click "Create filter". Choose "Skip the Inbox (Archive)" or "Delete it" to send matching emails straight to spam. Click "Create filter" to save.

In Outlook, go to Settings, then "Mail", then "Rules". Click "Add new rule". Give the rule a name, then set the condition — for example, "Subject contains [word]" or "From [domain]". Set the action to "Move to Junk". Click "Save" to explore the rule to all incoming mail.

Filters are powerful but can accidentally catch legitimate emails if your keyword is too broad. For example, a filter for "free" will catch real emails from friends who mention free shipping. Start with specific phrases that only appear in spam, and test the filter for a few days before leaving it on permanently.

When to use unsubscribe links and when to ignore them

Legitimate marketing emails — from retailers, newsletters, or services you signed up for — include an "Unsubscribe" link at the bottom. Clicking it removes you from that mailing list and is safe to do. The sender is legally required to honor the unsubscribe request within 10 business days.

Scam emails and unsolicited spam do not include a real unsubscribe link, or the link leads to a phishing page designed to steal your password. Do not click unsubscribe on emails from unknown senders, especially if the email asks you to confirm your password or personal information. Instead, block the sender or mark the email as spam.

If you are unsure whether an email is legitimate, check the sender's address carefully. Scammers often use addresses that look similar to real companies — for example, "paypa1.com" instead of "paypal.com". Hover over the sender's name to see the full email address. If it does not match the company's official domain, block it and do not click any links.

Why you should never reply to spam or click links in suspicious emails

Replying to spam or clicking a link in a suspicious email tells the sender that your address is active and monitored. This confirms your email is worth targeting, and you will receive more spam as a result. Scammers sell active email addresses to other scammers, multiplying the spam you receive.

Clicking links in suspicious emails can also install malware on your device or take you to a fake login page designed to steal your password. If an email claims to be from your bank, email provider, or a service you use, do not click the link in the email. Instead, go directly to the official website by typing the address into your browser, or call the company's customer service number.

What to do if spam is overwhelming your inbox

If you receive hundreds of spam emails per day, blocking and filtering individual senders will not solve the problem. The issue is usually that your email address has been sold to spam networks or exposed in a data breach. In this case, consider creating a new email address for important contacts — banks, employers, family — and keeping your old address only for online shopping and signups.

You can also reduce spam by being selective about where you share your email address. Avoid posting your email publicly on websites or social media. When shopping online, uncheck the box that says "Send me promotional emails" or "Subscribe to our mailing list". Use a temporary email service for one-time signups or free trials if you do not want to receive future emails from that sender.

If you believe your email address was exposed in a data breach, check haveibeenpwned.com (a free service run by security researcher Troy Hunt). Type your email address to see if it appears in any known breaches. If it does, change your password on any accounts that use that email address, especially banking and email accounts.

Frequently Asked Questions

Does blocking a sender delete their old emails from my inbox?

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, select the messages, then click "Delete" or move them to trash.

Can I block an entire domain instead of just one email address?

Gmail and Outlook do not have a built-in "block domain" feature, but you can create a filter that catches all emails from a domain. In Gmail, create a filter with "From: @domain.com" (replace domain.com with the actual domain). In Outlook, create a rule with "From [domain]". All emails from that domain will go to spam.

What if I accidentally blocked someone I wanted to hear from?

You can unblock them anytime. In Gmail, go to Settings, "Filters and Blocked Addresses", find the address, and click "Unblock". In Outlook, go to Settings, "Mail", "Junk email", find the address under "Blocked senders", and click the X. Their future emails will go to your inbox normally.

Is it safe to mark an email as spam instead of blocking the sender?

Yes. Marking as spam trains your email provider's filter to recognize similar emails in the future, but it does not block the sender completely. Blocking is stronger — it stops all emails from that address. For one-time spam, marking as spam is usually enough. For repeated spam from the same sender, block them.

Why do I still get spam after blocking and filtering?

Spammers use new email addresses constantly, so blocking one address does not stop spam from similar senders. If you receive many emails on the same topic from different addresses, create a filter for a keyword instead of blocking individual senders. If spam is overwhelming, your email address may have been sold to spam networks, and you may need to create a new address for important contacts.