docs(turbosign): Custom Email Domain (bring your own email) guide

[nicolasiscoding]

Summary

Adds a how-to guide for the new Custom Email Domain feature under TurboSign: connecting an organization's own Amazon SES or SendGrid account so signature emails send from the customer's domain.

What the page covers

• Prerequisites (feature-licensed org admin, provider account with a DKIM-verified domain)
• Connecting Amazon SES (with a copy-paste least-privilege IAM policy) or SendGrid (restricted API key with the mail.send scope)
• Choosing a sending domain from the provider's already-verified domains, including the pending-verification state and the DMARC advisory chip
• Sender identity (local part + display name) with the live From-line preview
• Optional custom signing domain via CNAME, with the advisory status chip
• Failure behavior choice (fall back to TurboDocx sending vs pause sending)
• Branding toggle, test send, and how the audit trail preserves compliance
• Troubleshooting and FAQ

Assets

• New page: docs/TurboSign/Custom Email Domain.md (sidebar position 9)
• Six screenshots under static/img/turbosign-custom-email/
• Cross-links the existing Email Deliverability (DKIM / DMARC / SPF) page

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https://claude.ai/code/session_01A4GWdRYseu6oZomyAY5BZd