How Does Synthio Validate Email Addresses?
Synthio offers real-time email validation in the form of SMTP negotiation. This is a process where our email servers contact the recipient’s email server to see if the recipient has a valid email address on that server. We only return an email address if it has been validated in this manner. A small percentage of the time, the email server will not specify if the email address is valid or invalid because it will accept any naming convention before the domain. We specify these email addresses/servers as “accept all” and note that specification in the results.