c# - SMTP gmail 客户端在不同的主机上工作很奇怪

Question

我用 C# 编写了以下用于发送消息的代码:

bool ret = false;
MailAddress fromAddress = new MailAddress("addressfrom@gmail.com", "Name");
string fromPassword = "MyPassw";

        try
        {
            SmtpClient smtp = new SmtpClient
            {
                //Host = "smtp.gmail.com",
                //Port = 587,
                //EnableSsl = true,

                Host = "rs.t-home.mk",
                Port = 25,
                EnableSsl = false,
                DeliveryMethod = SmtpDeliveryMethod.Network,
                UseDefaultCredentials = false,
                Credentials = new System.Net.NetworkCredential(fromAddress.Address, fromPassword)
            };

            System.Web.UI.WebControls.MailDefinition md = new System.Web.UI.WebControls.MailDefinition();
            md.From = "addressfrom@gmail.com";
            md.IsBodyHtml = false;
            md.Subject = subject;
            System.Collections.Specialized.ListDictionary replacements = new System.Collections.Specialized.ListDictionary();
            MailMessage msg = md.CreateMailMessage("mailTo@address.com", replacements, body, new System.Web.UI.Control());//belinaljupce@belina.com.mk
            smtp.Send(msg);
            ret = true;
        }
        catch
        {
            ret = false;
        }

在本地测试此代码时，使用此 SmtpClient 设置:

Host = "smtp.gmail.com",
Port = 587,
EnableSsl = true

一切正常，我可以发送消息，也可以发送到我的 Gmail 帐户的“发送”文件夹中我可以看到所有来自此 SmtpClient 的发送消息

但是当我在服务器上发布此代码时，我必须在其中使用此 SmtpClient 设置:

Host = "rs.t-home.mk",
Port = 25,
EnableSsl = false

我可以发送电子邮件，正常情况下，它工作正常，但在我的 Gmail 帐户的发送文件夹中，我没有看到来自此 SmtpClient 的发送消息，尽管邮件已发送(我已经检查过，并且“mailTo@address.com”接收邮件)所以我很好奇是什么原因造成的，并想知道如何解决这个问题。

Answer 1

I can send e-mail, normally, it works fine, but into the Send folder of my Gmail account I don't see the send message from this SmtpClient, although the mail is send (I've checked, and "mailTo@address.com" receive the message) So I'm curious what causes this, and wonder how to fix this.

这是因为 rs.t-home.mk 不是 Gmail SMTP 服务器。更简单的“解决方法”是将您的 Gmail 帐户包含在密件抄送中。