The SPF (Sender Policy Framework) record check does a query for the DNS records and returns any available SPF records for a given domain name
For more information on SPF, check this article "What is SPF check"

Optionally you can customize the monitoring location

This test allows only 3 location options
Subscription accounts feature up to 40 location options and allow you
to define multiple locations for each monitoring service

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• Error detection and verification
• Configure your own pricing
• Website Test behind the Great Firewall of China