MailSlurp documentation agent setup

Title: Set up custom email domains with MailSlurp
Description: Create branded email addresses with MailSlurp custom domains, verify DNS, manage sender authentication, and route messages through inboxes and APIs.
Canonical URL: https://www.mailslurp.com/docs/custom-domains/
Markdown URL: https://www.mailslurp.com/docs/custom-domains.md

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