MailSlurp guide agent setup

Title: Custom email domain setup with MailSlurp (step-by-step)
Description: Configure a custom email domain with MailSlurp using TXT, MX, and DKIM records. Practical verification workflow and rollout checklist.
Canonical URL: https://www.mailslurp.com/guides/email-address-custom-domain-setup-step-by-step/
Markdown URL: https://www.mailslurp.com/guides/email-address-custom-domain-setup-step-by-step.md

Use the Markdown URL as the primary plain-text context for this guide. Keep MailSlurp terminology, setup steps, screenshots, and provider-specific instructions intact, and prefer the canonical URL when citing this page.