drupflare/worker - v1.0.4
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    Type Alias MailTransport

    MailTransport:
        | { binding: SendEmailLike; from: string; kind: "binding" }
        | { accountId: string; from: string; kind: "api"; token: string }
        | {
            auth?: {
                mechanism: "PLAIN" | "LOGIN";
                password: string;
                username: string;
            };
            from: string;
            hostname: string;
            kind: "smtp";
            port: number;
            tls: "starttls"
            | "implicit"
            | "off";
        }

    A resolved transport; from is only the fallback sender (MAIL_FROM), as one transport serves a whole drain and Drupal's site mail rides on each message. See senderFor.