YahooMailProxy

Neutral Block: Depends Verified robots.txt: No

Yahoo Mail Proxy is a content fetch proxy that retrieves the page content of URLs that are embedded within emails sent to Yahoo Mail users. Having the content displayed through the proxy improves the security for email users while reducing overall network usage.

Key facts

Operator: Yahoo
Family: Yahoo
Purpose: General Crawl
User-Agent: YahooMailProxy
Should you block it?: Depends
Verified: Yes
Respects robots.txt: No
Identity type: Unknown
Confidence: Medium
Last verified: 2026-04-01
Last checked: 2026-04-01

Bot details

Identity

User-Agent: YahooMailProxy
robots.txt token: YahooMailProxy
HTTP user-agent: YahooMailProxy; https://help.yahoo.com/kb/yahoo-mail-proxy-SLN28749.html
Aliases: Yahoo Mail

Ownership

Operator: Yahoo
Family: Yahoo
Type: Scraper
Purpose: General Crawl

Verification and trust

Source type: Unknown
Confidence: Medium
Last verified: 2026-04-01
Last checked: 2026-04-01
Verification: Validate the identifying user-agent or signature against the operator documentation before creating hard allow rules.
Operator URL: https://help.yahoo.com/kb/yahoo-mail-proxy-SLN28749.html
Source URL: https://help.yahoo.com/kb/yahoo-mail-proxy-SLN28749.html
Spoofing risk: User-agent strings can be spoofed. For allow-listing or low-friction rules, pair the published identifier with operator documentation or cryptographic verification when available.

Blocking and detection

Robots

User-agent: YahooMailProxy
Disallow: /

Cloudflare

(http.user_agent contains "YahooMailProxy")

Advanced server rules

Apache

RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} YahooMailProxy [NC]
RewriteRule ^ - [F,L]

Nginx

if ($http_user_agent ~* "YahooMailProxy") { return 403; }

Notes

Having the content displayed through the proxy improves the security for email users while reducing overall network usage.

Known user-agent patterns: YahooMailProxy Known user-agent strings: YahooMailProxy; https://help.yahoo.com/kb/yahoo-mail-proxy-SLN28749.html Robots.txt handling in the directory: no.

Operator documentation: https://help.yahoo.com/kb/yahoo-mail-proxy-SLN28749.html

Evidence and source

Validate the identifying user-agent or signature against the operator documentation before creating hard allow rules.
Yahoo Mail Proxy is a content fetch proxy that retrieves the page content of URLs that are embedded within emails sent to Yahoo Mail users. Having the content displayed through the proxy improves the security for email users while reducing overall network usage.
User-agent strings can be spoofed. For allow-listing or low-friction rules, pair the published identifier with operator documentation or cryptographic verification when available.

https://help.yahoo.com/kb/yahoo-mail-proxy-SLN28749.html