MLS listing records contain the listing agent's professional contact information — name, brokerage, and the email address registered with their MLS board at the time of licensing. This is the highest-quality starting point for agent email data: current as of their last license renewal, confirmed as a professional address (not a personal Gmail), and tied to an active business event. Here is how to extract it and what to expect.
The RESO Field Structure
In the RESO Web API standard, agent contact information is stored in the Member resource, accessible via the MemberEmail and MemberLoginId fields. The ListingAgent resource links each listing to a Member record. A well-structured MLS API call returns the listing with the associated agent's email inline. Coverage varies by MLS board — some boards include full contact details in the listing response, others require a separate query to the Member endpoint using the agent's MemberKey.
When Agent Email Is Missing
Some MLS boards suppress agent email in API responses to prevent spam, returning only the agent's name and brokerage. In these cases, Hunter.io's domain search feature can find the professional email pattern for the brokerage domain and verify the agent's address using name matching. For example, if the brokerage domain is @remax.com, Hunter.io will find the email pattern (firstname.lastname or firstnamelastname) and verify whether the agent's email follows it. Supplemental enrichment covers the gap in approximately 70 to 80 percent of cases. The full enrichment pipeline is at omnionlinestrategies.com/real-estate-agent-outreach-machine.