What to use for checking.
WEB-BASED LOOKUP TOOLS
Query DNS from outside your own network. The quickest check.
Look for one that lets you query authoritative nameservers directly.
MULTI-LOCATION CHECKERS
Query from several places, showing how far a change has spread.
Useful during a migration.
MAIL RECORD CHECKERS
Check MX, SPF, DKIM and DMARC together and report problems.
Faster than checking each separately.
COMMAND LINE TOOLS
Available on every operating system. Faster than any web interface once you know the syntax.
Worth learning two or three commands if you manage DNS regularly.
WHAT CPANEL PROVIDES
Zone Editor for your records Email Deliverability for mail record validation
That second screen is the fastest mail diagnosis available.
WHOIS
Shows the registrar, the expiry date and the nameservers.
The first thing to check for any DNS problem.
WHAT TO CHECK WITH WHICH
WHOIS for nameservers and expiry A lookup tool for records Email Deliverability for mail Authoritative queries for whether a change is made
