Sending a generated customer-support report from a custom domain is simplest when the application owns the message template and the delivery service owns transport state. Use an HTTP API to submit the attachment, authenticate the sending domain with SPF and DKIM, and consume bounce and suppressi...
Source: [Dev.to](https://dev.to/linusholm3764/support-report-email-deliverability-service-custom-domain-setup-spf-dkim-bounce-handling-197p)