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If you decide to send from a separate domain for deliverability reasons, this is the official, no nonsense setup guide for the authentication records that keep your email out of spam. It's dry, but it's a primary source rather than a marketing blog padded with upsells, and it takes about ten minutes to action. Use it once, then forget it exists.
Set up SPF
From Google Workspace Help by Google Workspace 10 min setup
- SPF, DKIM, and DMARC are the three DNS records that establish your domain's sending reputation.
- Set them up before you send any real volume of outbound email from a new domain.
- Give each record 24 to 48 hours to propagate before you rely on it.
