feat: add debug logging for SMTP configuration and detailed mail delivery status

paperless-backend/src/postprocessing/mail.service.ts

@@ -25,10 +25,27 @@ export class MailService {
     body: string;
     html?: string;
     attachments?: { filename: string; content: Buffer }[];
+    smtpOverride?: { host: string; port: number; secure: boolean; user: string; pass: string; from: string };
   }): Promise<void> {
-    const from = this.configService.get<string>('SMTP_FROM', 'paperless@localhost');
+    let transporter = this.transporter;
+    let from = this.configService.get<string>('SMTP_FROM', 'paperless@localhost');
 
-    await this.transporter.sendMail({
+    if (options.smtpOverride) {
+      const o = options.smtpOverride;
+      transporter = nodemailer.createTransport({
+        host: o.host,
+        port: o.port,
+        secure: o.secure,
+        auth: { user: o.user, pass: o.pass },
+      });
+      from = o.from || from;
+    } else {
+      this.logger.debug(
+        `SMTP config — host: ${this.configService.get('SMTP_HOST')} port: ${this.configService.get('SMTP_PORT')} secure: ${this.configService.get('SMTP_SECURE')} user: ${this.configService.get('SMTP_USER')} from: ${from}`,
+      );
+    }
+
+    const info = await transporter.sendMail({
       from,
       to: options.to,
       subject: options.subject,
@@ -40,6 +57,8 @@ export class MailService {
       })),
     });
 
-    this.logger.log(`Mail gesendet an ${options.to}: "${options.subject}"`);
+    this.logger.log(
+      `Mail gesendet an ${options.to}: "${options.subject}" — messageId: ${info.messageId} accepted: ${JSON.stringify(info.accepted)} rejected: ${JSON.stringify(info.rejected)} response: ${info.response}`,
+    );
   }
 }