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Set up Twilio SendGrid DNS on Google Cloud

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This guide shows how to configure DNS records for Twilio SendGrid on Google Cloud, including SPF, DKIM, DMARC and domain verification records. The fastest way to do this is with the mail2dns CLI, which automatically creates all required records for your domain in seconds.

Setup

If needed, install mail2dns before following the below steps:

npm i -g mail2dns
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Note: The gcloud CLI must be installed and configured. mail2dns will use the active gcloud project, or you can specify a project by supplying the project ID to the ‑‑project option or CLOUDSDK_CORE_PROJECT environment variable.

The account used must have the following permissions:

  • dns.managedZones.list
  • dns.resourceRecordSets.list
  • dns.resourceRecordSets.create
  • dns.resourceRecordSets.update
Interactive Prompts
Environment Variables
Flags

That's it! After running the setup command, the required DNS records will be created for your domain at Google Cloud to work with Twilio SendGrid.

Optional Flags

--project Google Cloud project ID to use -o --no-mx Skip MX records (set up DNS for outbound email only) -y --yes Skip confirmation prompts (the command will error if any required inputs are missing) --allow-insecure-flags Allow secrets to be passed via command-line flags (not recommended) -d --dry-run Show records that would be created without applying them

DNS records required for Twilio SendGrid

Twilio SendGrid requires the following DNS records to send email from your domain. These are created automatically by the mail2dns setup command:

TXT Record

@ → v=spf1 include:sendgrid.net ~all

TXT Record

_dmarc → v=DMARC1; p=none;

CNAME Record

s1._domainkey → {DKIM1}

CNAME Record

s2._domainkey → {DKIM2}

If any of these records are missing or incorrect, email delivery may fail or messages may be more likely to be marked as spam.

Protecting Secrets

When running the mail2dns setup command, if you provide credentials via flags these will be visible in your shell history and process list. To avoid this, you can provide credentials via environment variables or interactively. If you understand the risks and still want to provide credentials via flags, you should take steps to ensure that the input is not saved in shell history, and avoid running it on a shared or public machine.

By default, the setup command will error if you provide secrets via flags: to enable them you must opt in by passing the --allow-insecure-flags option, or setting M2D_ALLOW_INSECURE_FLAGS=true environment variable.

Non-interactive mode

You may wish to run the mail2dns setup command without any confirmation prompts (by default, mail2dns asks you to confirm the DNS records it creates before applying them). To do this, use the ‑‑yes or ‑y flag with the setup command. Be sure to review the DNS records that will be created before running the command with this flag, as it will apply all changes without confirmation.

Any mix of flags and environment variables may be used to provide the required values. By default any missing values will be prompted for, or in non-interactive mode the command will produce an error if there are missing required values.

Related Setups

For Twilio SendGrid

For Google Cloud