C#中的Pop3到SMTP消息自定义转发器

using System;
using System.Net.Mail;
using System.Net.Mime;
using System.Threading.Tasks;

namespace Pop3ToSmtpForwarder
{
    class Program
    {
        static async Task Main(string[] args)
        {
            // 从Pop3服务器获取邮件
            var pop3Client = new Pop3Client("pop3.example.com", 995, "username", "password");
            var messages = await pop3Client.GetMessagesAsync();

            // 遍历邮件并转发到Smtp服务器
            foreach (var message in messages)
            {
                var smtpClient = new SmtpClient("smtp.example.com", 587)
                {
                    Credentials = new System.Net.NetworkCredential("username", "password"),
                    EnableSsl = true
                };

                var mailMessage = new MailMessage
                {
                    From = new MailAddress("sender@example.com"),
                    To = { "recipient@example.com" },
                    Subject = message.Subject,
                    Body = message.Body,
                    IsBodyHtml = message.IsBodyHtml
                };

                // 添加附件
                foreach (var attachment in message.Attachments)
                {
                    mailMessage.Attachments.Add(new Attachment(attachment.ContentStream, attachment.Name));
                }

                // 发送邮件
                await smtpClient.SendMailAsync(mailMessage);
            }
        }
    }
}