The fastest way to block an email sender

Most email services let you block a sender in one or two clicks. In Gmail, open the email, click the three dots in the top right, and select "Block [sender]". In Outlook, right-click the email and choose "Block". In Apple Mail, click the sender's name at the top and select "Block Contact". Once blocked, emails from that address go straight to spam and you won't see notifications.

Blocking works best for individual senders you recognize — a person harassing you, a service you signed up for by mistake, or someone whose emails you simply don't want to see. It does not stop someone from sending you mail; it just hides it from your inbox. If the sender switches to a new email address, you'll need to block that one too.

The block stays in place until you remove it. You can unblock a sender anytime by going to your blocked list (usually in settings) and clicking "unblock" next to their name.

Key Takeaways

  • Blocking a sender takes seconds and sends their future emails to spam automatically, though they can still send mail from a different address.
  • Unsubscribe links in marketing emails are faster than blocking if you simply don't want the messages anymore — blocking is better for unwanted contact from people you know.
  • Spam filters catch most bulk junk, but marking emails as spam trains your filter to catch similar messages in the future.
  • If someone is harassing you, blocking is a first step, but saving the emails and reporting them to your email provider or law enforcement may be necessary.
  • Email rules and filters let you automatically sort, delete, or move emails from certain senders without blocking them completely.

When to unsubscribe instead of blocking

Marketing emails, newsletters, and notifications from services you signed up for should be unsubscribed from, not blocked. Every legitimate marketing email has an "Unsubscribe" link at the bottom. Click it and you're removed from that mailing list — the sender stops sending you mail, rather than your email hiding it.

Unsubscribing is better than blocking because it actually stops the sender from mailing you, whereas blocking just hides their mail on your end. If you block a newsletter instead of unsubscribing, the sender keeps sending emails; they just pile up in your spam folder and waste server space. Unsubscribing is also faster if you get dozens of emails from the same sender — one click removes them all at once.

If an email has no unsubscribe link, or the link doesn't work, then blocking is the right move. Legitimate senders are required to include a working unsubscribe option, so a missing link is a sign the email is spam or from someone not following the rules.

Using filters and rules to sort emails automatically

Filters let you handle emails from a sender without blocking them completely. Instead of hiding all their mail, you can automatically move it to a folder, delete it, or mark it as read. This is useful when you want to keep emails from someone but don't want them cluttering your inbox.

In Gmail, open an email from the sender, click the three dots, and select "Create filter". You can then choose to skip the inbox, apply a label, or delete automatically. In Outlook, right-click an email and select "Create Rule", then pick what to do with future messages from that sender. In Apple Mail, go to Mail > Preferences > Rules and set up conditions for emails matching the sender's address.

Filters are also useful for sorting emails by topic or keyword, not just by sender. You could filter all emails with "invoice" in the subject line to a billing folder, or all emails from your manager to a priority folder. Unlike blocking, filters keep the emails — they just organize them out of your main inbox.

Marking emails as spam to train your filter

When you mark an email as spam, two things happen: that email moves to your spam folder, and your email provider learns that similar messages are unwanted. Over time, this trains your spam filter to catch comparable emails automatically, even if they come from new addresses.

Marking as spam is different from blocking. Blocking targets one specific sender; marking as spam teaches your filter patterns. If you get dozens of emails with the same subject line or similar content from different addresses, marking a few as spam helps your filter recognize and catch the rest.

Most email services show a "Report spam" or "Mark as spam" button in the toolbar or in a right-click menu. Use it for bulk junk, phishing attempts, and emails that look suspicious. The more you mark, the smarter your filter becomes at catching similar messages before they reach your inbox.

Blocking senders on mobile email apps

Blocking works the same way on phones as on computers, but the steps are slightly different because of how mobile apps are laid out. In Gmail on iPhone or Android, swipe left on an email (iPhone) or long-press it (Android), then tap the block icon. In Outlook mobile, swipe left on an email and tap the trash icon, then select "Block Sender" from the options that appear.

On Apple Mail for iPhone, swipe left on an email and tap "More", then "Block This Contact". On Android's default email app, long-press an email and look for a block or spam option in the menu. The blocked sender's future emails go to spam on all your devices — blocking on your phone blocks them on your computer too, because the setting syncs across devices.

If you can't find a block option in your mobile app, you can always open the email in your web browser and block from there. The web version of Gmail, Outlook, and most other services has the same blocking features as the app.

What to do if someone is harassing you

Blocking stops you from seeing someone's emails, but it does not stop them from sending them. If someone is harassing you — sending threatening messages, unwanted contact after you've asked them to stop, or repeated emails designed to upset you — blocking is a necessary first step, but it may not be enough.

Save the emails before you block. Most email services let you download or export messages. Keep copies of the sender's address, the dates and times of the emails, and the content. If the harassment continues from new addresses or escalates, you have a record to show to your email provider or to law enforcement.

Report the harassment to your email provider. Gmail, Outlook, Apple, and others have abuse teams that investigate threats and harassment. You can report an email by clicking the three dots and selecting "Report phishing" or "Report abuse" — even though those options are labeled for phishing, most providers use them to handle harassment too. If the harassment is severe or involves threats, contact local police and provide them with the saved emails.

Blocking emails from entire domains

If you're getting spam from many addresses at the same domain — like multiple addresses ending in @spamcompany.com — you can block the entire domain instead of blocking each address one by one. This stops all emails from that domain from reaching your inbox.

In Gmail, create a filter (three dots > Create filter) and enter the domain in the "From" field using the format @spamcompany.com. Then select "Delete" or "Skip the inbox". In Outlook, create a rule with the same domain format and choose to delete or move to junk. In Apple Mail, create a rule that matches emails where the sender contains @spamcompany.com.

Blocking a domain is powerful but risky if you might need emails from that domain in the future. For example, if you block @company.com because one person there is harassing you, you'll also miss emails from your contacts at that company. Use domain blocking only when you're certain you don't need any emails from that address.

Frequently Asked Questions

Can someone tell if I blocked them?

No. When you block someone, they don't receive a notification. Their emails still go out, but they land in your spam folder instead of your inbox. They have no way to know you blocked them unless you tell them or they notice you're not responding to their emails.

What's the difference between blocking and unsubscribing?

Unsubscribing removes you from a mailing list — the sender stops sending emails to you. Blocking hides incoming emails from a sender in your spam folder, but they can still send mail. Use unsubscribe for newsletters and marketing; use blocking for unwanted contact from people you know.

If I block someone, will old emails from them disappear?

No. Blocking only affects new emails. Old messages from that sender stay in your inbox or wherever they are. If you want to delete old emails from a blocked sender, you have to delete them manually or use a filter to move them to trash.

Can I block emails by subject line or keyword?

Not with a simple block — you need to create a filter instead. In Gmail, Outlook, and Apple Mail, you can set up a filter that automatically deletes or moves emails containing certain words or phrases, without blocking a specific sender.

What if a blocked sender creates a new email address?

You'll see emails from the new address in your inbox because the block only applies to the original address. You can block the new address the same way you blocked the first one. If someone keeps creating new addresses to contact you, save all the emails and report the harassment to your email provider.