The fastest way to block spam depends on your email provider
Most email services let you block a sender in two or three clicks: open the message, find a menu button (usually three dots or a downward arrow), and select "Block" or "Block sender". Gmail moves blocked messages to spam automatically. Outlook does the same. Yahoo Mail, Apple Mail, and ProtonMail all work the same way — the blocked sender's future messages go straight to your spam folder, and you won't see notifications.
The catch is that blocking one address only stops that exact address. If a spammer uses a new address each time, you'll need to block each one separately. For that reason, most people combine blocking with other tools: marking messages as spam, using filters to sort mail automatically, and adjusting your privacy settings so fewer people can find your address in the first place.
Key Takeaways
- Blocking a sender takes seconds in any email service — open the message, tap the menu, and select "Block" or "Block sender".
- Blocking only stops that exact email address, so spammers using new addresses each time will still get through unless you mark them as spam too.
- Creating filters or rules can automatically send certain messages to spam based on keywords, sender domain, or subject line.
- Unsubscribing from legitimate marketing emails is faster than blocking them, and most services show an unsubscribe link at the bottom of the message.
- Changing your privacy settings to limit who can email you, and avoiding posting your address online, stops spam before it starts.
How to block a sender in Gmail
Open the spam message in Gmail. Look for the three-dot menu icon in the top right corner of the email. Tap it and select "Block [sender's name]". Gmail will move all future messages from that address to your spam folder automatically.
If you want to block an entire domain (for example, all addresses ending in @spamsite.com), you'll need to use Gmail's filter feature instead. Click the three-dot menu, select "Create filter", and in the "From" field type the domain you want to block. Then choose "Delete it" or "Skip the inbox" to send those messages to spam. Gmail filters work on new messages only — they won't affect emails you've already received.
How to block a sender in Outlook and Outlook.com
Open the message you want to block. Select the three-dot menu at the top right and choose "Block". Outlook will send that sender's future messages to your junk folder and won't show you notifications.
To block an entire domain in Outlook, use the junk mail rules. Go to Settings (the gear icon), then "View all Outlook settings", then "Mail" and "Junk email". In the "Blocked senders" section, type the email address or domain you want to block. You can add multiple addresses or domains separated by semicolons. Outlook also lets you create rules that automatically sort mail based on sender, subject line, or keywords — go to "Mail" and "Rules" to set those up.
Blocking spam in Yahoo Mail, Apple Mail, and other services
Yahoo Mail: Open the message, click the three-dot menu, and select "Block". Yahoo will move future messages from that sender to spam.
Apple Mail (on iPhone, iPad, or Mac): Open the message, tap or click the sender's name at the top, then select "Block This Contact". On a Mac, you can also right-click the message and choose "Block Sender".
ProtonMail: Open the message, click the three-dot menu, and select "Block sender". ProtonMail also lets you create filters by going to Settings, then "Filters", then "Create new filter" — you can filter by sender, subject, or keywords.
Most other email services follow the same pattern: find the menu on the message, look for "Block", "Block sender", or "Junk", and select it. If you can't find the option, check the service's help documentation for "block sender" or "spam filter".
When to unsubscribe instead of block
If the email is from a real company — a store you shopped at, a service you signed up for, a newsletter you once wanted — look for an "Unsubscribe" link at the very bottom of the message. Clicking it removes you from their mailing list permanently. This is faster and more reliable than blocking, because it tells the sender to stop, rather than just hiding their messages from you.
Unsubscribe links are required by law in most countries for marketing emails. If you don't see one, the message is likely spam or a phishing attempt, and blocking is the right move. Legitimate companies make unsubscribe easy to find; scammers hide it or don't include it at all.
Using filters and rules to catch spam automatically
Most email services let you create rules that automatically sort or delete messages based on patterns. Instead of blocking one sender at a time, you can tell your email to send anything with certain words in the subject line, or from a certain domain, straight to spam.
In Gmail, click the three-dot menu on any message and select "Create filter". You can filter by sender, subject line, keywords in the body, or size. Choose what you want to happen to matching messages — send them to spam, delete them, or skip your inbox. In Outlook, go to Settings, then "Mail", then "Rules" to create similar filters. Yahoo Mail has a "Filters" option under Settings. These filters apply to new messages only, so they won't clean up spam you've already received.
Filters work best when you're getting repeated spam with the same subject line or from the same domain. If you're getting random one-off spam, blocking individual senders or marking messages as spam is usually faster.
Preventing spam before it starts
The most effective spam prevention happens before you get the messages. Don't post your email address on public websites, social media, or forums where spam bots can harvest it. If you need to share your address online, use a plus sign or period trick: Gmail ignores anything after a plus sign, so you can give out yourname+website@gmail.com and filter all those messages later. Some services also let you create temporary or disposable email addresses for signups you're unsure about.
Check your email provider's privacy settings. In Gmail, go to Settings and "Forwarding and POP/IMAP" to see who can contact you. In Outlook, check "Privacy" settings to limit who can find your address in the directory. Avoid replying to spam or clicking "unsubscribe" on messages from unknown senders — that confirms your address is active and can lead to more spam.
What to do if blocking isn't working
If you've blocked a sender but their messages still appear, they may be using a new email address each time. Check whether the messages are actually from the same person or organization by looking at the full email address, not just the display name. Spammers often change the address slightly (adding numbers or letters) to get around blocks.
If the messages are coming from different addresses but the same organization, create a filter that blocks the entire domain instead of individual addresses. If you're getting phishing emails that pretend to be from your bank or a service you use, report them to that organization and to your email provider — most services have a "Report phishing" or "Report spam" option in the message menu. Never click links or download attachments from suspicious emails, even if you've blocked the sender.
Frequently Asked Questions
Can I unblock a sender after I've blocked them?
Yes. In Gmail, go to Settings, then "Filters and Blocked Addresses", find the blocked sender, and click "Unblock". In Outlook, go to Settings, then "Junk email", then "Blocked senders", find the address, and remove it. Other services have similar options in their settings or blocked-sender lists.
Does blocking a sender delete their old messages?
No. Blocking only affects new messages going forward. Old emails from that sender stay in your inbox unless you delete them manually. If you want to clean them up, search for the sender's address and delete the results.
What's the difference between blocking and marking as spam?
Blocking stops future messages from a specific address. Marking as spam tells your email provider that a message is unwanted and helps train the spam filter to catch similar messages in the future. You can do both — mark a message as spam and then block the sender.
Will blocking someone stop them from seeing my read receipts or knowing I opened their email?
Blocking affects incoming messages only. If you've already opened an email before blocking the sender, they may have already seen a read receipt. To prevent this going forward, turn off read receipts in your email settings — most services let you disable them globally or per-message.
Can I block all emails from a country or language?
Most email services don't have built-in country or language filters, but you can create rules that block messages based on keywords or sender patterns. Some third-party spam filters and email clients offer more advanced filtering, but they usually cost money and require setup outside your main email provider.