The fastest way to stop unwanted email is to use your email provider's built-in blocking tools

Every major email service — Gmail, Outlook, Yahoo Mail, Apple Mail — has a block feature built into the interface. When you block a sender, their messages skip your inbox and go straight to spam or a blocked folder. The block is permanent unless you remove it later. This works when ready and requires no setup beyond clicking a button.

The catch is that blocking works only on email addresses you can see. If a sender uses a new address each time, or if the email came from a spoofed address (one that looks real but isn't), blocking that specific address won't stop the next message. For those situations, you need filters or rules instead.

Key Takeaways

  • Blocking a sender sends their future messages to spam; it works when ready but only stops that exact email address.
  • Filters and rules let you block patterns — like all mail from a domain, or mail with certain words in the subject line — so they catch spoofed or rotating addresses.
  • Unsubscribe links in legitimate marketing email are usually real, but only use them if you recognize the sender.
  • Never reply to spam, click links in suspicious email, or read attachments from unknown senders, even to unsubscribe.
  • If you gave your email to a service and now regret it, check that service's privacy settings or contact them to remove your address from their list.

How to block a sender in Gmail, Outlook, and Yahoo Mail

In Gmail, open the email from the sender you want to block. Click the three-dot menu in the top right, then select "Block [sender's name]". Gmail will send future messages from that address to spam automatically. You can unblock them later by going to Settings > Filters and Blocked Addresses > Blocked addresses, finding the sender, and clicking Unblock.

In Outlook (both Outlook.com and Outlook desktop), right-click the email and choose "Block". Outlook moves the sender to your Blocked Senders list. To see or change your blocked list, go to Settings > Mail > Junk email in Outlook.com, or File > Options > Trust Center > Junk Email in the desktop version.

In Yahoo Mail, click the three-dot menu on the email and select "Block sender". Yahoo moves future messages to spam. To manage your blocked list, go to Settings > Security and Privacy > Blocked Addresses.

In Apple Mail on Mac or iPhone, select the email, then go to Mail > Block Sender (Mac) or swipe left and tap the flag icon, then "Block This Contact" (iPhone). On both devices, you can view blocked senders in Settings > Mail > VIP and Blocked Contacts.

Using filters and rules to catch email you can't see the sender of

Filters work differently from blocking. Instead of targeting one email address, a filter targets a pattern — a domain name, a word in the subject line, or a phrase in the body. This matters because spam often comes from addresses that change with each message, or from addresses that look real but are faked.

In Gmail, open any email matching the pattern you want to block. Click the three-dot menu, then "Filter messages like this". Gmail shows you what it will match on — sender, subject, words, or any combination. Click "Create filter" and check "Delete it" or "Skip the inbox (Archive it)". Gmail applies the filter to all future mail matching that pattern.

In Outlook, go to Settings > Mail > Junk email > Blocked Senders. You can add a sender's address or an entire domain (for example, @spamcompany.com). Outlook also has a "Safe Senders" list — if you add a sender there, their mail always reaches your inbox even if it looks like spam.

In Yahoo Mail, go to Settings > Filters. Click "Add new filter", name it, and set the condition (sender, subject, or body text) and the action (delete, move to spam, or move to a folder). Yahoo applies it to all incoming mail from that point forward.

When to use unsubscribe links and when to ignore them

Legitimate marketing emails — newsletters, promotional offers, account notifications — usually include an unsubscribe link at the bottom. If you recognize the sender and signed up for their list, unsubscribing is safe and usually works within a few days. The sender is legally required to honor it under the CAN-SPAM Act (in the United States) or similar laws in other countries.

Do not click unsubscribe on email from senders you don't recognize. Clicking the link confirms your email address is real and active, which can lead to more spam. The same applies to emails that look like they're from banks, payment services, or government agencies but ask you to click a link or read something. These are often phishing attempts designed to steal your password or personal information.

If you signed up for a service — a shopping site, a social network, a utility company — and now receive unwanted email from them, log into your account on their website and look for email preferences or notification settings. Changing those settings is safer than clicking unsubscribe in the email itself, because you know you're on the real website.

Why blocking one address sometimes doesn't stop the spam

Spam senders often use a technique called spoofing, where they forge the "From" address to make the email look like it came from someone else. When you block the address shown in the email, the next message comes from a different forged address, so your block doesn't catch it. Filters work better here because you can block an entire domain or a pattern of words instead of one address.

Some spam also comes from legitimate services whose accounts have been compromised. If you receive spam from what looks like a real company, go to that company's website directly (don't click any links in the email) and report the issue. They can help shut down the compromised account.

If blocking and filtering aren't stopping the spam, the email may be coming from a botnet — a network of hacked computers sending mail automatically. In that case, the best option is to create a new email address for important contacts and keep your old one for less critical services. This is a last resort, but it works.

Protecting your email address so you receive less spam in the first place

Spam often starts because your email address was sold or leaked from a service you used. You can't undo that, but you can slow down how much spam you receive going forward. When you sign up for a website or service, check whether they have a privacy setting that lets you opt out of marketing email or third-party sharing. Many do, and checking the box takes 10 seconds.

If you use your email address in public places — forums, social media, product reviews — expect more spam. Consider using a separate email address just for those purposes, and keep your main address for people and services you trust.

Some email providers offer features to help. Gmail has a feature that lets you add a plus sign and any word to your address (for example, shopping+amazon@gmail.com), and mail to that address still reaches you. You can use different versions for different services, then filter or block by the version if one service sells your address. Yahoo and some other providers offer similar features.

What to do if your email address is being impersonated

If you receive bounce-back messages or complaints from people saying they got spam from your email address, your address is likely being spoofed. This doesn't mean your account was hacked — it means someone is forging your address as the sender. You can't stop this directly, but you can take steps to limit the damage.

First, check your own email account for signs of compromise: look at your login history (most providers show this in Settings > Security or Account Activity), change your password to something strong and unique, and enable two-factor authentication if you haven't already. If your account was actually hacked, the attacker may have sent spam from inside your account, which is different from spoofing.

Second, if people are complaining about spam from your address, ask them to report it as spam rather than marking it as legitimate. This trains email filters to recognize the spoofed mail as spam. You can also contact your email provider's support team and let them know your address is being spoofed — they may be able to add extra protections.

Frequently Asked Questions

Does blocking someone let them know I blocked them?

No. When you block a sender, they don't receive a notification. Their emails straightforward go to your spam folder or a blocked folder, and they have no way to know whether you blocked them, marked them as spam, or straightforward didn't read their message.

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

Yes, using filters or rules. In Gmail, create a filter and use the "From" field with the domain (for example, @unwanteddomain.com). In Outlook, add the domain to your Blocked Senders list. In Yahoo, create a filter with the domain in the "From" condition. This blocks all mail from anyone at that domain.

What if I blocked someone by mistake and want to unblock them?

You can unblock them anytime. In Gmail, go to Settings > Filters and Blocked Addresses > Blocked addresses, find the sender, and click Unblock. In Outlook, go to Junk email settings and remove them from the Blocked Senders list. In Yahoo, go to Filters and delete the filter. In Apple Mail, go to VIP and Blocked Contacts and remove them from the blocked list.

Is it safe to click "Report spam" instead of blocking?

Yes. Reporting spam sends a copy of the email to your provider so they can train their spam filters. It also usually moves the message to spam automatically. Reporting is often better than blocking alone because it helps protect other users too.

Why do I still get spam after I unsubscribed?

Unsubscribe requests can take several days to process, and some senders ignore them. If spam continues after two weeks, the sender is likely not honoring the request. Use blocking or filters instead. If the sender claims to be a legitimate company, report them to your email provider — they may be violating anti-spam laws.