swaks (Swiss Army Knife for SMTP) is a powerful command-line tool for testing and debugging SMTP servers. It allows users to craft custom SMTP sessions with fine-grained control over headers, authentication, TLS, attachments, and more. swaks is commonly used by sysadmins and developers to diagnose mail delivery problems or test SMTP server configurations.
...Sitecheck can also spot some common causes of PCI compliance failure such as insecure content on secure pages, SQL injection/cross-site scripting (XSS) vulnerabilities, insecure encryption ciphers and open mail relays. Sources of information leakage such as email addresses and IP addresses in the headers or the page will be logged. Includes a separate module called domaincheck which checks the domain expiry date, SSL certificate expiry date and SPF records.