feat: add configurable sender name and allow users to choose between system and personal SMTP accounts when sending emails

paperless-backend/src/inbox/inbox.controller.ts

@@ -203,11 +203,14 @@ export class InboxController {
       body: string;
       html?: string;
       segments: { pages: number[]; filename: string }[];
+      sender?: string;
     },
     @Request() req: any,
   ): Promise<void> {
     const preferredUsername: string | null = req.user?.preferredUsername ?? null;
-    const smtpOverride = await this.userSettingsService.getSmtpConfig(req.user.userId);
+    const smtpOverride = body.sender === 'user'
+      ? await this.userSettingsService.getSmtpConfig(req.user.userId)
+      : null;
     await this.inboxService.sendAsEmail(id, preferredUsername, {
       ...body,
       smtpOverride: smtpOverride ?? undefined,