Google Is Ending Gmail’s Third-Party “Send As”: What to Do Before 2027

Why it matters

Changing your email architecture without updating DNS authentication can result in:

• Increased spam-folder placement.
• Failed authentication.
• Spoofing exposure.
• Customer trust issues.
• Business email compromise risk.

Example

If company.com moves its outbound mail from Provider A to Provider B but leaves outdated SPF records behind, the new sending infrastructure may fail authentication.

Practical application

Before migration:

• Audit SPF.
• Enable DKIM.
• Establish DMARC monitoring.
• Review authorized sending services.
• Remove obsolete infrastructure.
• Test internal and external delivery.

XgenPlus states that SPF, DKIM, and DMARC are enforced as part of its security architecture.

Key takeaway: A mailbox migration is incomplete until DNS authentication, deliverability and security controls have been validated.

Why Encryption and S/MIME Should Be Part of the Migration Conversation

Email authentication proves where a message came from, but it does not by itself provide end-to-end confidentiality. For organizations exchanging sensitive financial, legal, government, or customer information, encryption and S/MIME can provide stronger protection through cryptographic signing and message encryption.