To set up Cloudflare Email Routing with Gmail’s “Send mail as” feature, you’ll first configure Cloudflare to forward incoming mail to your Gmail address, then use Google’s SMTP servers as a bridge for outgoing mail.

1. Onboard Domain: In the Cloudflare Dashboard, go to Email > Email Routing and select Onboard Domain.
2. Add Records: Cloudflare will prompt you to add necessary MX and TXT (SPF) records. Select Add records and enable.
3. Create Routing Rule:
   • Go to the Routing Rules tab and click Create address.
   • Custom address: Enter your professional email (e.g., info@yourdomain.com).
   • Destination: Enter your personal Gmail address.
4. Verify: Check your Gmail inbox for a verification email from Cloudflare and click the link to activate the route.

Because Cloudflare does not provide an outgoing SMTP server, you must use Gmail’s own SMTP service with an App Password.

1. Enable 2FA: Ensure 2-Step Verification is turned on in your Google Security Settings.
2. Generate App Password:
   • Go to the App Passwords page.
   • Select Mail for the app and Other (name it “Cloudflare SMTP”) for the device.
   • Copy the 16-character password provided; you will need it in the next step.

1. Add Address: In Gmail, go to Settings > See all settings > Accounts and Import.
2. Configure SMTP: Under Send mail as, click Add another email address. Enter your name and custom domain email.
3. Enter Server Details:
   • SMTP Server: smtp.gmail.com
   • Port: 587 (TLS)
   • Username: Your full Gmail address
   • Password: The App Password you generated earlier
4. Finalize: Enter the confirmation code sent to your email to verify ownership.

To ensure your emails aren’t marked as spam, you must authorize both Cloudflare and Google to send mail on your behalf in your Cloudflare DNS settings. [1, 12]

• Type: TXT
• Name: @
• Content: v=spf1 include:_spf.mx.cloudflare.net include:_spf.google.com ~all

5. DMARC Policy

To help both the email recipient and sender protect against email spoofing, phishing, and spam, you should also add a DMARC Policy to monitor emails. Ensure the p parameter is set to none.

In Cloudflare DNS, create a new TXT record:

Type: TXT
Name: _dmarc
TTL: auto
Content: v=DMARC1; p=none; rua=mailto:you@your-domain.com

Or multiple Email Addresses

Content: v=DMARC1; p=none; rua=mailto:you@your-domain.com,hello@your-domain.com

Add them separated by a comma, one after the other, for multiple email addresses.

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Note: This post is taken from a Google search and is being published here for my future reference.

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