Debugger

A collection of useful debug tools

Email / SPF

• SPF Email to IP Debugger Quick check to see if an email address is allowed to send from a given IP.
• SPF Syntax Validator Check if a given SPF record syntax is valid. Useful when writing SPF records.
• SPF Policy Tester Check the SPF record for a site in detail using more verbose logs.
• RDNS Check Lookup reverse DNS for a given site.
• Blacklist Check Check if a site is on a known email blacklist.

Domain / DNS

• Check DNS See if your A record has propagated worldwide.
• Lookup IP Find the IP address for a site.

HTTPS / SSL

• SSL Labs Check for SSL installation issues.
• HTTPS Checker Check for HTTPS mixed content issues.
• Moving to HTTPS Community build migration guide.

Misc.

• Robots.txt Checker Test robots.txt rules.
• Mobile-Friendly Test Google's mobile friendliness tool.