SSL Certificate Analysis for mail.mugen.dev - Security Grade & TLS Configuration

SSL Verification Bypassed

The server's SSL certificate could not be verified. The analysis was completed using insecure mode. Data may be less reliable.

Reason:

Hostname Mismatch - certificate is issued for mail.yandex.ru, posta.yandex.com.tr, xn--80a1acny.xn--d1acpjx3f.xn--p1ai, mail.ya.ru, mail.yandex, mail.360.yandex.kg, mail.360.yandex.ee, mail.360.yandex.uz, mail.360.yandex.tm, not for mail.mugen.dev

Open Cached · just now

92/100 SECURITY SCORE

Certificate Information

Subject

C=RU, ST=Moscow, L=Moscow, O=YANDEX LLC, CN=mail.yandex.ru

Issuer

C=BE, O=GlobalSign nv-sa, CN=GlobalSign RSA OV SSL CA 2018

Valid From

October 10, 2025

Valid Until

April 09, 2026 87 days

Public Key

RSA 2048 bit Adequate

Signature Algorithm

SHA256-RSA

SHA-256 Fingerprint

FE:84:DA:07:A4:45:47:6C:02:F4:26:28:4C:CE:81:2E:47:EC:10:9B:EF:5C:FE:F7:32:0E:26:7B:14:1E:0E:A8

Alternative Names

40 domains

Security Configuration

TLS Protocols

TLS 1.0 TLS 1.1 TLS 1.2 TLS 1.3

Forward Secrecy

Supported (Modern clients use PFS)

Warnings

• TLS 1.1 is deprecated and should be disabled
• TLS 1.0 is deprecated and should be disabled

HTTP Security Headers

Status

Strict-Transport-Security

Excellent

max-age=315360000; includeSubDomains; preload

Content-Security-Policy

Basic

default-src; style-src; script-src; +14 more

default-src 'none';style-src 'self' yastatic.net static.yandexcom.net 'unsafe-inline' 'unsafe-eval' s3.mds.yandex.net s3.mdst.yandex.net;script-src 'self' yastatic.net static.yandexcom.net mc.admetrica.ru mc.yandex.ru mc.yandex.kz mc.admetrica.com mc.yandex.com mc.yandex.com chat.s3.yandex.net api-maps.yandex.ru suggest-maps.yandex.net export.yandex.com 'unsafe-eval' 'unsafe-inline' 'nonce-955af9c39f73-4269-bdc2-2c17c2d4de50' https://yastatic.net/s3/frontend/butterfly/latest/butterfly.js;img-src 'self' yastatic.net static.yandexcom.net https://ysa-static.passport.yandex.ru https://ysa-static.passport.yandex.net yandex.st data: mc.admetrica.ru mc.yandex.ru mc.yandex.kz mc.admetrica.com mc.yandex.com mc.yandex.com api-maps.yandex.ru *.captcha.yandex.net s3.mds.yandex.net s3.mdst.yandex.net avatars.mds.yandex.net avatars.mdst.yandex.net avatars.mds.yandexcom.net clck.yandex.ru *.maps.yandex.net yapic.yandex.ru img.yandex.ru static-maps.yandex.ru https://video-tub-ru.yandex.net https://img0-tub-ru.yandex.net https://img1-tub-ru.yandex.net https://img2-tub-ru.yandex.net https://img3-tub-ru.yandex.net yango.com funtechservices.com blob: mc.webvisor.com mc.webvisor.org https://downloader.disk.yandex.ru;font-src 'self' data: yastatic.net static.yandexcom.net;object-src yastatic.net static.yandexcom.net;media-src *.captcha.yandex.net data: yastatic.net static.yandexcom.net;connect-src mail.yandex.com 'self' mc.admetrica.ru mc.yandex.ru mc.yandex.kz mc.admetrica.com mc.yandex.com mc.yandex.com *.captcha.yandex.net trust.yandex.ru trust.yandex.com suggest-maps.yandex.net mc.webvisor.com mc.webvisor.org yandex.ru api.passport.yandex.com *.disk.yandex.net;frame-ancestors 'self';frame-src 'self' yandex.st s4.money.yandex.net https://yandex.com/chat split.yandex.ru yastatic.net static.yandexcom.net yandex.com pass.yandex.com magic.passport.yandex.com passport.yandex.com https://trust.yandex.com id.yandex.com blob: mc.admetrica.ru mc.yandex.ru mc.yandex.kz mc.admetrica.com mc.yandex.com mc.yandex.com https://yandex.ru/forms https://forms.yandex.ru/;child-src 'self' yandex.st yandex.com passport.yandex.com pass.yandex.com https://trust.yandex.com blob: mc.yandex.ru;report-uri https://csp.yandex.net/csp?from=passport&project=passport&yandex_login=&yandexuid=7306311101768173340;manifest-src 'self' yastatic.net static.yandexcom.net;form-action 'self' passport.yandex.com passport.yandex.fi passport.yandex.kz;base-uri 'self';script-src-attr 'none';upgrade-insecure-requests

X-Frame-Options

Good

SAMEORIGIN

X-Content-Type-Options

Good

nosniff

Referrer-Policy

Present

origin

Permissions-Policy

Missing

Not configured

Recommendations

• Improve CSP by adding more specific directives and removing 'unsafe-inline'
• Consider adding Permissions-Policy to control browser features

CAA Records (Certificate Authority Authorization)

CAA Records

Not Configured (Any CA can issue certificates)

CAA Issues

• No CAA records configured - any CA can issue certificates

Recommendations

• Implement CAA records to restrict which CAs can issue certificates for your domain
• This adds an extra layer of security against unauthorized certificate issuance
• Example: Add CAA record 'example.com. CAA 0 issue "letsencrypt.org"'
• Consider adding 'iodef' record to receive security incident reports