How to Block Junk and Phishing Emails in Yahoo Mail (2026)

Your Yahoo Mail inbox is filling up with junk, sketchy "your account is suspended" messages, and senders you have already tried to get rid of. You want them gone, and you want to stop the next wave before it arrives.

Yahoo already runs automatic filters that catch most spam, malware, and phishing. The actions below mostly train that system and clean up whatever slips through, so the more consistently you use them, the quieter your inbox gets.

One thing worth knowing up front: these controls work best inside Yahoo's own apps or webmail, not inside third-party email programs. Yahoo even recommends turning off the spam filters in outside email clients, since those sit beyond Yahoo's control. Start with the quickest fixes, then move to the heavier tools.

Mark the Email as Spam (Fastest Fix)

This is the single most effective move. It removes the message and teaches Yahoo to route future mail from that sender straight to Spam.

In New Yahoo Mail on a desktop browser:

1.Select the unwanted email.
2.Click the "Mark as spam" button (the spam icon).
3.Future emails from that same sender are now sent to the Spam folder.

If you change your mind, click the More options icon (three dots), open the Spam folder, choose the email, and click "Not spam." Future messages from that sender will be delivered to your inbox again.

If the message is from a trusted mailing list, Yahoo may instead offer "Unsubscribe" to stop the messages, versus "Report as spam," which marks it and moves it to Spam.

Mark as Spam on Your Phone

In the Yahoo Mail app on iOS and Android:

1.Open an email, or tap Edit to select multiple emails.
2.Tap the More icon.
3.Tap "Mark as spam."

To unsubscribe from a mailing list instead, open the email, tap the More icon, then tap "Unsubscribe." If there is no Unsubscribe option, mark it as spam. You can also open the dedicated "Unsubscribe" view, find the mailing list, tap "Unsubscribe," and confirm by tapping "Unsubscribe" again.

Using a mobile browser rather than the app? Sign in, select one or more emails, tap the More icon (three dots), then tap "Mark as Spam." To reverse it, open the Sidebar menu, tap the Spam folder, select the emails, tap the More icon, and tap "This is not spam."

Block the Sender's Address

Blocking permanently stops a specific address. You can block up to 1000 addresses, and you can do it anonymously.

In New Yahoo Mail (desktop browser):

1.Click the More options icon (three dots).
2.Select Settings.
3.Click Security and Privacy.
4.Under "Blocked addresses," click the Add button.
5.Enter the email address you want to block.
6.Click Save.

To unblock later, return to Settings > Security and Privacy, mouse over the blocked address, and click the Delete icon.

On the older, classic version of Yahoo Mail the path is nearly identical: click the Settings icon, select More Settings, click Security and Privacy, then add or remove addresses under "Blocked addresses" the same way.

Stop Spoofed Mail That Keeps Arriving

If you blocked a sender but their mail keeps coming, the From address is probably spoofed, meaning it has been forged to display a different name or address than the real sending address. Blocking the displayed address does nothing in that case.

To stop it, you need the true sending address:

1.View the email's full headers.
2.Compare the From: address to the "Received" and "Mailfrom" fields. The true sending address appears in the top-most Received or Mailfrom field.
3.Block that real address.
4.Set up a filter to automatically route these messages into a folder such as Trash (see below).

Create a Filter to Auto-Sort Junk

Filters catch unwanted mail by sender or subject and move it where you want, including straight to Trash. You can create up to 500 of them.

In New Yahoo Mail (desktop browser):

1.Click the More options icon and select Settings.
2.Click Filters.
3.Click "Add new filters."
4.Enter a filter name, set the rules (for example, by sender or subject), and choose or create a destination folder. For junk, you can route to Trash.
5.Click Save at the bottom.

Filter ordering matters. Filters apply top-down, and if two filters match the same email, only the top one is used. Reorder with the up and down arrows, and place broad junk rules carefully so they do not catch mail you wanted. To edit or delete, go to Settings > Filters, click the filter to save changes, or use the Delete icon.

Block an Entire Domain (Yahoo Mail Plus)

If junk keeps arriving from many addresses at the same company, domain blocking stops all of it at once. This feature is available only with a paid Yahoo Mail Plus subscription, and only while that subscription is active. You can block up to 500 domains.

On a desktop browser:

1.Click the Settings icon, then More Settings.
2.Select Security and Privacy.
3.Under "Block unwanted sender domains," click Add.
4.Type the domain you want blocked.
5.Click Save.

To remove a domain, click the Delete (trash) icon.

In the Yahoo Mail app (iOS and Android) for Plus subscribers: tap the Profile icon, tap the Settings icon, then under "Block unwanted sender domains" select your Yahoo account if prompted. Tap "+ Add a domain," enter the domain, and tap "Ok" or "Add." To remove one, tap the X, then confirm with "Remove" or "Unblock."

One caveat: once you block a domain, you are also unsubscribed from that brand.

Spot and Report Phishing

Phishing messages try to trick you into handing over passwords or personal information. Yahoo helps flag them, but your judgment is the last line of defense.

Watch for Yahoo's warnings. An alert may appear at the top of your inbox, and a red exclamation mark may sit next to a sender when an email looks "phishy." A verified-brand check mark next to a sender's name means the email genuinely came from the real brand, though this indicator currently applies to brand logos and senders only. Its absence does not by itself prove a message is fake, and the verification icon will not appear in some apps even when the email is truly from Yahoo; in those cases, verify the sender's actual email address rather than relying on the icon.

When you see a suspicious message:

1.Do not respond, click links, or open attachments. Never share passwords or personal info through unexpected messages.
2.If an alert is shown, click the "Report" or "Remove sender" button in the notification.
3.For an unmarked suspicious email, select its checkbox and click the Spam button to move it to Spam, which also improves Yahoo's filtering.

Use Yahoo's Built-in Safety Alerts

Yahoo Mail surfaces several alerts you can act on directly. If it detects a "phishy" sender, you can click "It's safe" to dismiss future alerts or "Report" to escalate. If an address already in your contacts sends something that looks like spam, Yahoo highlights it and offers "It's safe" or "Remove sender and mark as spam." If a message's reply-to address differs from the sender's address, Yahoo shows an alert at the top prompting you to secure your account if you did not set that up.

For mail coming from a Yahoo Mail account that involves spam, impersonation, harassment, or other Terms of Service violations, you can click Spam on the email and select a reason, and you can report it to Yahoo directly through a help-form Report Abuse request. Yahoo also runs separate dedicated forms for certain issues, including a "Take It Down Request Form" for non-consensual sexual imagery (prioritized for removal within 48 hours) and a form for problematic Yahoo Search results.

Let the Spam Folder Clear Itself

You do not need to manually purge junk. By default, the Spam folder is automatically emptied after 30 days and Trash after 7 days, and these timers cannot be changed. While you wait, never click links or images inside spam messages.

Frequently Asked Questions

Why do I still get email from a sender I already blocked?

The From address is most likely spoofed, meaning it is forged to show a different address than the real one. Blocking the displayed address does nothing then. Open the full headers, find the true sending address in the top-most Received or Mailfrom field, block that address, and add a filter to route the mail to Trash.

How many senders, domains, and filters can I set up?

You can block up to 1000 individual addresses and create up to 500 filters. Domain blocking allows up to 500 domains, but only with an active Yahoo Mail Plus subscription.

Does marking an email as spam also block the sender?

Yahoo describes these as separate actions. Marking as spam trains the system and routes future messages from that sender to Spam, while blocking adds the address to your Blocked addresses list. To be certain a sender is fully blocked, add the address under Settings > Security and Privacy.

Do I have to empty my Spam folder myself?

No. The Spam folder auto-empties after 30 days and Trash after 7 days, and you cannot change these timers. Avoid clicking anything inside spam messages while they sit there.

Should I just unsubscribe instead of marking as spam?

For a trusted mailing list, Unsubscribe is the cleaner choice, and Yahoo often offers it directly. For untrusted or phishing messages, do not click "unsubscribe" links inside them; report them as Spam or delete them instead.

Why don't these tools work well in my other email app?

Spam training works best inside Yahoo's own apps or webmail. Yahoo recommends disabling the spam filters in third-party email clients, since those sit outside Yahoo's control and can interfere with its filtering.