As of January 2026, Google has retired the "Check mail from other accounts" POP3 feature for Gmail. This means the service no longer supports pulling emails from external providers via POP3. Moving forward, setting up email forwarding is the primary way to manage a custom domain through the Gmail web interface.
Note: This guide assumes you already have your DKIM and DMARC records properly configured for your domain.
For custom domain names, standard email forwarding often breaks SPF (Sender Policy Framework) checks because the forwarding server is not an authorized sender for the original domain.