The fastest way to reduce spam is to use your email provider's built-in filters and mark unwanted messages as spam

Most spam never reaches your inbox if you turn on the right settings. Gmail, Outlook, Yahoo Mail, and Apple Mail all have spam filters that learn from your choices — the more you mark messages as spam, the better they get at catching similar ones. Start by opening your email, finding a spam message, and clicking the "Report spam" or "Mark as junk" button. Your email provider then trains its filter to catch that sender and similar messages in the future.

The second layer is to stop giving your email address to places that sell it. Spammers buy email lists from websites, retailers, and data brokers. Every time you enter your email into an online form without reading the fine print, you may be opting into marketing lists. Before you submit your address anywhere, look for a checkbox that says "I agree to receive promotional emails" — if it is checked by default, uncheck it. If you cannot find that checkbox, the site may be planning to sell your address anyway.

You can also create a separate email address just for online shopping, signups, and forms. Keep your main email private and share it only with people you know and services you trust. This way, spam goes to your secondary address and your primary inbox stays clean.

Key Takeaways

  • Mark spam messages as spam or junk in your email provider's interface — this trains the filter to catch similar messages automatically.
  • Uncheck marketing consent boxes before submitting your email address to websites, because checked boxes mean you are opting into promotional lists.
  • Create a separate email address for online shopping and form signups so spam does not reach your main inbox.
  • Never reply to spam or click unsubscribe links in unsolicited emails, because doing so confirms your address is active and leads to more spam.
  • Use email filtering rules to automatically sort messages from known senders into folders, keeping your inbox focused on what matters.

How to set up filters and rules in your email provider

Most email providers let you create rules that automatically sort or delete messages based on the sender's address or keywords in the subject line. In Gmail, open Settings, click Filters and Blocked Addresses, then click Create a new filter. Type the sender's email address or a keyword you want to catch, then choose what happens to those messages — you can send them straight to spam, delete them, or move them to a folder.

Outlook works similarly: go to Settings, then Mail, then Rules. Click Add rule and enter the sender's address or subject line keywords. You can then choose to move messages to a folder, delete them, or mark them as spam. Yahoo Mail has a similar feature under Settings > Filters. Apple Mail on Mac and iPhone uses rules found in Mail > Preferences > Rules (Mac) or Settings > Mail > VIP (iPhone).

The most useful rule is one that catches messages with common spam keywords in the subject line — words like "act now", "limited time", "claim your", or "congratulations you won". Create a rule that catches any message with those words and sends it to spam automatically. This stops a large category of spam before it clogs your inbox.

Unsubscribe links and why they sometimes backfire

Legitimate marketing emails include an unsubscribe link at the bottom, usually in small text. If you receive a message from a real company you once bought from or signed up for, clicking unsubscribe will remove you from their list. However, unsubscribe links in unsolicited spam often do the opposite — they confirm to the spammer that your address is active and monitored, which leads to more spam from that sender and others who buy your address.

The safest approach is to mark the message as spam first. If you are certain the sender is legitimate — you recognize the company name, you remember signing up, the email looks professional — then unsubscribe. But if you have no idea who sent it or the email looks suspicious, mark it as spam and do not click anything in the message.

Some email providers now hide unsubscribe links or warn you before you click them. Gmail, for example, shows a warning if you are about to unsubscribe from a mailing list. Pay attention to these warnings — they exist because clicking unsubscribe on spam often makes things worse.

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

Replying to spam or clicking links in unsolicited emails tells the sender that your address is real and that you read their message. This makes your address more valuable on the spam market. Spammers sell lists of "confirmed active addresses" for more money than lists of addresses they have never heard from. By replying or clicking, you move yourself into the higher-value category.

Clicking links in suspicious emails also exposes you to phishing scams, where the link takes you to a fake website designed to steal your password or financial information. Even if the email looks like it came from your bank or email provider, do not click the link. Instead, go directly to the official website by typing the address into your browser yourself.

The same rule applies to attachments. Never open an attachment from someone you do not know or from an email that looks suspicious. Attachments can contain malware that infects your computer or steals your information. If you are unsure whether an attachment is safe, mark the email as spam and delete it.

How to report spam to your email provider and law enforcement

Your email provider wants to know about spam because it helps them improve their filters. When you mark a message as spam, you are already reporting it. But if you receive a large volume of spam from the same sender, you can report it directly to your provider's abuse team. Gmail's abuse report form is at google.com/webmasters/tools/spam-report. Outlook's is at microsoft.com/en-us/concern/mail-spam. Yahoo Mail has a report form at yahoo.com/mail/help/report-spam.

If the spam is part of a phishing scam or involves fraud, you can also report it to the Federal Trade Commission at reportfraud.ftc.gov. The FTC collects these reports to identify patterns and take action against scammers. Reporting does not stop the spam you have already received, but it helps protect other people from the same scam.

Some spam comes from compromised email accounts — a friend's account was hacked and is now sending spam to their entire contact list. If you receive spam from someone you know, tell them directly so they can find their account. They may not realize their email has been compromised.

What to do if spam is coming from a hacked account or data breach

If you suddenly receive a large amount of spam after entering your email into a new website or service, that website may have been hacked. Check haveibeenpwned.com and enter your email address to see if your information appeared in a known data breach. If it did, change your password on that service when ready and on any other service where you used the same password.

If spam is coming from a hacked account — your own or someone else's — the solution is to find the account. Change the password to something long and unique, enable two-factor authentication if the service offers it, and check the account's recovery email and phone number to make sure a hacker has not changed them. If it is someone else's account, send them a message through another channel (text, phone, social media) to let them know their email has been compromised.

Once you have secured the account, the spam usually stops within a few days. The hacker moves on to other accounts. In the meantime, mark the spam messages as spam so your email filter learns to catch similar ones.

Using third-party email filters and blocklists

If your email provider's built-in filter is not catching enough spam, you can add a third-party filter. Services like SaneBox, Clean Email, and Unroll.me connect to your email account and use more aggressive filtering rules. They can sort newsletters into a separate folder, unsubscribe you from mailing lists in bulk, and catch spam your provider missed. Most of these services offer a free version with limited features and a paid version with more control.

Another option is to use a blocklist — a list of known spam senders that your email provider can check against. Some email providers let you import blocklists from third parties. Gmail does not have this feature built in, but Outlook and some other providers do. Check your email provider's settings to see if blocklist import is available.

Be cautious with third-party filters: they require access to your email account, so only use services from companies you trust. Read their privacy policy to understand what they do with your email data. Most legitimate services do not read or store your emails — they only use metadata like sender addresses and subject lines to filter.

Frequently Asked Questions

Why do I get more spam after I unsubscribe from a mailing list?

Clicking unsubscribe on spam confirms your address is active and monitored, which makes it more valuable to spammers. Your address may then be sold to other spammers or added to more mailing lists. Mark spam as spam instead of unsubscribing unless you are certain the sender is a legitimate company you signed up for.

Can I block all emails from a specific sender?

Yes. In Gmail, open the email, click the three dots menu, and select Block. In Outlook, right-click the sender's name and choose Block. In Yahoo Mail and Apple Mail, look for a Block or Add to Blocked Senders option in the email menu. Blocked senders' messages go straight to spam automatically.

Is it safe to use my email address on public websites?

Public websites often sell email addresses to marketing companies. If you must enter your email on a public site, create a separate email address just for that purpose. Keep your main email private and share it only with people and services you trust.

What should I do if I think my email account has been hacked?

Change your password when ready to something long and unique. Enable two-factor authentication if available. Check your account recovery email and phone number to make sure they have not been changed. Review your recent login activity to see if anyone else has accessed your account. If you see suspicious activity, sign out all other sessions.

Do spam filters work better if I pay for email?

Paid email services like ProtonMail and Tutanota often have better spam filters than free services, but Gmail and Outlook's free versions have very good filters if you set them up correctly. The difference is usually small. The most important step is marking spam as spam consistently so your filter learns what you consider unwanted.