isLoopbackMailHost (mail/sender.ts)

TypeScript mail sender with TLS handling, retries, and raw RFC822 output for iOS.

// Source: https://github.com/agenticmail/agenticmail | License: MIT | Copyright 2026 Ope Olatunji
// Provided via justclaw.it.com; keep this notice with the code.
import nodemailer from 'nodemailer';
import MailComposer from 'nodemailer/lib/mail-composer/index.js';
import type { Transporter } from 'nodemailer';
import type { SendMailOptions, SendResult } from './types.js';

export interface MailSenderOptions {
  host: string;
  port: number;
  email: string;
  password: string;
  authUser?: string;
  secure?: boolean;
  tlsRejectUnauthorized?: boolean;
}

export interface SendResultWithRaw extends SendResult {
  /** Raw RFC822 message bytes (for appending to Sent folder) */
  raw: Buffer;
}

/** True for loopback hosts — the bundled local mail server lives here. */
export function isLoopb

... (truncated -- full source via MCP)