After you add a custom sender, open its setup from Email & SMS > Email Senders and choose Authenticate domain. HeySummit uses the custom From address only after the email address is verified and all domain checks are ready.
Domain authentication requires three DKIM CNAME records, an SPF-aligned MAIL FROM return path with MX and TXT records, and one valid DMARC policy. These records protect deliverability and allow receiving mail servers to verify messages sent from your domain.
Set up the records
In the sender setup, copy the three DKIM CNAME names and values into your DNS provider.
Add the MX and TXT records shown under SPF-aligned return path for the dedicated MAIL FROM subdomain.
Add a valid DMARC TXT record at _dmarc.your-domain. If you are unsure what policy to use, ask the person who manages your domain because DMARC affects every email service on that domain.
Select Check DNS records now. HeySummit keeps checking incomplete authentication automatically, and verification can take time after DNS changes are published.
What happens before verification: A custom sender that is not ready does not stop event emails. HeySummit falls back to the managed @events.heysummit.com address and shows a warning so you can finish the setup. Once the saved domain checks are valid, the custom address can be applied to event emails.
If DNS temporarily cannot be checked, HeySummit preserves the last verified state and retries. If the records are correct but provider verification has failed, the setup will retry automatically.
For the complete sender workflow, see Creating a Custom Email Address.