Service Provider Checker Semrush [extra Quality] — Email

Use a DNS lookup tool to see where the mail is routed.

💡 Use SEMrush to find the keywords your competitors use in their paid search ads, then subscribe to their email list to see if those same themes carry over into their lead nurturing sequences. Best Tools for ESP Identification email service provider checker semrush

The app identifies syntax errors, inactive domains, and server responses to categorize emails as "Verified," "Risky," or "Invalid". Use a DNS lookup tool to see where the mail is routed

SEMrush does not have a standalone tool labeled “ESP Checker.” Instead, its ESP detection capabilities are embedded within two key features: and the Technology Lookup tool (powered by SEMrush’s partnership with data aggregators). SEMrush does not have a standalone tool labeled

Open a newsletter from the brand, view the "original source," and look for the "X-Mailer" or "Received" tags.

Since Semrush cannot do this natively, you should pair Semrush with a tool. These tools scan a website's source code to identify which services they use.

SEMrush typically detects the ESP used for web forms, landing page pop-ups, and embedded signup widgets —not necessarily the backend bulk email-sending system. However, for most small-to-medium businesses, these are one and the same.