From the moment a site is provisioned it can send email — sign-in links, notifications — from its assigned subdomain. Connect a custom domain and the platform provisions a sending identity for it on Amazon SES.

Three records to verified

Settings → DNS lists three DKIM CNAME records plus an MX and SPF pair for the bounce address. Add them at your DNS host; when DKIM verifies, sending flips automatically from the assigned subdomain to no-reply@yourdomain.com. No mailbox migration, no third-party sender showing in headers.

Deliverability by default

Mail is signed with your domain's DKIM keys and uses a dedicated MAIL FROM subdomain (notify.yourdomain.com), so SPF, DKIM, and DMARC alignment work the way mailbox providers expect.