This is the blog of Ronald Bartels that wanders on and off the subject of problem management (that is how it started), but it is best described by Ray who says this is Daddy's thoughts! Like the best music is from the Eighties and a wee dram helps in solving most inconveniences.
MX Toolbox - Supertool
All of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool. Input a domain name or IP Address or Host Name.
Links in the results will guide you to other relevant tools and
information. And you'll have a chronological history of your results.
Access the Supertool over at MX Toolbox here or checkout a more comprehensive list of tools over at LinkedIn here.