How can I verify whether a recipient email address actually exists before sending an envelope?

Question

Hi everyone,I’m integrating DocuSign with a C# application. Before sending an envelope, I want to validate the recipient’s email address.Currently, I can perform basic format validation, for example checking whether the email has a valid format such as user@company.com.However, I would like to know if there is a recommended way in the DocuSign API/SDK to determine whether the recipient email address actually exists and is deliverable before sending the envelope.For example:	Can DocuSign validate whether the mailbox actually exists?			Is there an API or recommended approach to check email deliverability before creating/sending the envelope?			If the email is invalid or undeliverable, can I detect this before the envelope is sent?	Any guidance on the recommended approach would be appreciated.Thanks!

Iandro.Simoes · Answer

Hi ​@sangeerth999No. Docusign does not provide a pre-send API that reliably confirms whether a mailbox exists or can receive mail.Recommended approach:Validate syntax and normalize the address in your application.Optionally check that the domain has valid DNS/MX records—but treat this only as a basic domain check.Send the envelope.Monitor delivery failures using Docusign Connect. Subscribe to the recipient-autoresponded event and include recipient data. This event indicates that Docusign received a delivery failure notification. Inspect the recipient’s status and autoRespondedReason, for example:{ "status": "autoresponded", "autoRespondedReason": "The email account that you tried to reach does not exist."}It can indicate a nonexistent address, but also an automatic response or recipient mail-system problem; do not treat it as absolute proof that the mailbox does not exist.Best regards,

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