Sources and methodology
The tracker uses public MX records to identify the providers receiving mail for company domains. Each snapshot includes its sources, observation date and sample size.
How the research works →EmailValidly ResearchA closer look at
A closer look at
how email works.
Explore the providers and infrastructure behind business email, with dated findings and evidence you can inspect.
Email infrastructureEmail provider
Email provider
market share tracker
See which providers receive mail for YC company domains. Explore the results by industry, country and reported team size, then download the evidence or copy a citation.
Based on published MX records. Each finding includes its date and sample size.
About the data
What the findings cover
Results describe the YC company domains in the sample, rather than the entire email market. MX records show where mail is received; they do not always reveal the mailbox service behind a security gateway.
Explore the findings →