testssl.sh is a free command line tool which checks a server's service on any port for the support of TLS/SSL ciphers, protocols as well as recent cryptographic flaws and more.
Now you can quickly view your DomainKeys, DKIM, and SPF validitay, and SpamAssassin score in one place.
Sicherheitseinstellung und protokolle bei Webbrowsern überprüfen
Test your client SSL/TLS settings and cipher specs
Spam Blacklist checks for a given IP
HTTPS certificate chain check if weak sha-1 cipher is used
Scan service from Mozilla to analyze the security of web pages/sites