ESP finder

Identifies the email service provider behind any email address

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ESP finder identifies which email service provider is behind any given email address, helping marketers filter free addresses out of a database to focus on B2B contacts and optimize deliverability by matching sending and receiving providers. It's built for email marketers who want cleaner segmentation and better deliverability.

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Full match profile

Behind the summary, Matchbox keeps a richer profile of ESP finder - the signals our matcher actually reads to decide when to surface it. It stays private; claim the listing to see and control it.

Problem & pain-point mapping
Who we surface it to (audience fit)
What it's a strong alternative to
Trust & credibility signals

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