- Shipped
- September 12, 2026 at 1:23 AM UTC
- Author
- Kamo
- Commit
- fac3bf8
The campaign's own From field, defaulted from the bulk provider, warns when the address is off the provider's domain, as mail that may land in spam. On the platform relay that is not a risk but a certainty: EmailService fails every recipient of a campaign whose From domain is not the relay's sending domain ("The bulk relay only sends as @domain"). So when the bulk provider carries a platform relay, an off-domain From is an error: the field is marked, an alert says what will happen and offers the provider default when that is on the relay's domain, and preflight blocks sending until it is fixed. Organizations on their own SMTP provider still get the softer spam warning.