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Email verification determines deliverability by checking MX records, SMTP responses, and mailbox existence to classify addresses as deliverable, risky, or invalid. It reduces bounce rates by ensuring list quality before outreach campaigns.

An SMTP check reveals whether an email address is deliverable, risky, or invalid by querying mail exchange records and mailbox existence. It validates that the receiving server accepts messages for that specific mailbox.

Yes, checking MX records is a core step in email verification. The process queries MX records alongside SMTP responses and mailbox existence to determine if an email address is deliverable, risky, or invalid.

Yes, you need a POLYMER_PAY_API_KEY for authentication. Requests are forwarded to the StableEnrich email-verifier endpoint via the Polymer Pay proxy using a JSON body containing the target email address.

List cleansing involves running email addresses through a verification service to check MX records and SMTP responses. This identifies invalid or risky addresses, optimizing outreach and improving deliverability for lead qualification.

Checking mailbox existence confirms whether the receiving server has an active account for the target address. Combined with MX and SMTP checks, it prevents bounces and protects sender reputation during outreach.