System.net.mail使用ssl发送邮件失败

原创

小哥 3年前 (2023-05-24) 阅读数 10 #大杂烩

我采用了.net 的内置组件System.Net.Mail发送电子邮件，主要是在客户成功注册网站时，是发送欢迎电子邮件。最近邮件一直无法发送，请查看腾讯smtp电子邮件配置，所有发送的电子邮件都替换为ssl我以前用过它25端口，现在替换为465或587因此，请按如下方式修改代码：

MailMessage msgMail = new MailMessage( "发件箱" , "收件箱" , "邮件标题" , "邮件内容" );

SmtpClient smtp = new SmtpClient( "smtp.qq.com" , 465);

smtp.EnableSsl = true ;

smtp.DeliveryMethod = SmtpDeliveryMethod.Network;

smtp.Credentials = new System.Net.NetworkCredential( "发件箱" , "发件箱登录密码" );

try

{

smtp.Send(msgMail);

}

catch (Exception ex)

{

Console.WriteLine( "发送完毕......" );

}

这仍然不起作用，操作已超时错误在国外科技网站上看到一句话System.Net.Mail支持Explicit SSL但它不受支持Implicit SSL然后，在检查了这两种模式的信息后，我将根据我的理解进行解释：

Explicit SSL 源自未加密25然后继续starttl握手并最终切换到加密连接。

Implicit SSL 直接从指定端口启动starttl握手。

既然指定了端口，那么应该就是使用了Implicit SSL我不知道微软什么时候可以更新它System.net.mail，System.net.mail可以在电子邮件中嵌入图像。此时，是不是无法使用腾讯邮箱发送电子邮件？答案肯定是否定的，foxmail是否可以配置发送电子邮件？我们可以利用CDO.Message和System.web.mail发送电子邮件。

C#利用CDO.Message发送邮件

如何引用CDO.Message？ cod.message参考位置： C:\Windows\System32\cdosys.dll

CDO.Message objMail = new CDO.Message();

try

{

objMail.To = "接收电子邮件帐户" ;

objMail.From = "发送电子邮件帐户" ;

objMail.Subject = "subject" ; //邮件主题string strHTML = @"";

strHTML = strHTML + "你可以在这里填写html内容" ;

objMail.HTMLBody = strHTML; //邮件内容

objMail.Configuration.Fields[ " [http://schemas.microsoft.com/cdo/configuration/smtpserverport](http://schemas.microsoft.com/cdo/configuration/smtpserverport) " ].Value = 465;//设置端口

objMail.Configuration.Fields[ " [http://schemas.microsoft.com/cdo/configuration/smtpserver](http://schemas.microsoft.com/cdo/configuration/smtpserver) " ].Value = "smtp.qq.com" ;

objMail.Configuration.Fields[ " [http://schemas.microsoft.com/cdo/configuration/sendemailaddress](http://schemas.microsoft.com/cdo/configuration/sendemailaddress) " ].Value = "发送电子邮件帐户" ;

objMail.Configuration.Fields[ " [http://schemas.microsoft.com/cdo/configuration/smtpuserreplyemailaddress](http://schemas.microsoft.com/cdo/configuration/smtpuserreplyemailaddress) " ].Value = "发送电子邮件帐户" ;

objMail.Configuration.Fields[ " [http://schemas.microsoft.com/cdo/configuration/smtpaccountname](http://schemas.microsoft.com/cdo/configuration/smtpaccountname) " ].Value = "发送电子邮件帐户" ;

objMail.Configuration.Fields[ " [http://schemas.microsoft.com/cdo/configuration/sendusername](http://schemas.microsoft.com/cdo/configuration/sendusername) " ].Value = "发送电子邮件帐户" ;

objMail.Configuration.Fields[ " [http://schemas.microsoft.com/cdo/configuration/sendpassword](http://schemas.microsoft.com/cdo/configuration/sendpassword) " ].Value = "发送电子邮件帐户登录密码" ;

objMail.Configuration.Fields[ " [http://schemas.microsoft.com/cdo/configuration/sendusing](http://schemas.microsoft.com/cdo/configuration/sendusing) " ].Value = 2;

objMail.Configuration.Fields[ " [http://schemas.microsoft.com/cdo/configuration/smtpauthenticate](http://schemas.microsoft.com/cdo/configuration/smtpauthenticate) " ].Value = 1;

objMail.Configuration.Fields[ " [http://schemas.microsoft.com/cdo/configuration/smtpusessl](http://schemas.microsoft.com/cdo/configuration/smtpusessl) " ].Value = "true" ;//这一句指示是否使用ssl

objMail.Configuration.Fields.Update();

objMail.Send();

}

catch (Exception ex) { throw ex; }

finally { }

System.Runtime.InteropServices.Marshal.ReleaseComObject(objMail);

objMail = null ;

C#利用System.web.mail发送邮件

System.Web.Mail.MailMessage mail = new System.Web.Mail.MailMessage();

try

{

mail.To = "收件人电子邮件" ;

mail.From = "发件人电子邮件" ;

mail.Subject = "subject" ;

mail.BodyFormat = System.Web.Mail.MailFormat.Html;

mail.Body = "body" ;

mail.Fields.Add( " [http://schemas.microsoft.com/cdo/configuration/smtpauthenticate](http://schemas.microsoft.com/cdo/configuration/smtpauthenticate) " , "1" ); //basic authentication

mail.Fields.Add( " [http://schemas.microsoft.com/cdo/configuration/sendusername](http://schemas.microsoft.com/cdo/configuration/sendusername) " , "发件人电子邮件" ); // set your username here

mail.Fields.Add( " [http://schemas.microsoft.com/cdo/configuration/sendpassword](http://schemas.microsoft.com/cdo/configuration/sendpassword) " , "发件人电子邮件密码" ); // set your password here

mail.Fields.Add( " [http://schemas.microsoft.com/cdo/configuration/smtpserverport](http://schemas.microsoft.com/cdo/configuration/smtpserverport) " , 465);// set port

mail.Fields.Add( " [http://schemas.microsoft.com/cdo/configuration/smtpusessl](http://schemas.microsoft.com/cdo/configuration/smtpusessl) " , "true" );// set is ssl

System.Web.Mail.SmtpMail.SmtpServer = "smtp.qq.com" ;

System.Web.Mail.SmtpMail.Send(mail);

//return true;

}

catch (Exception ex)

{

ex.ToString();

}

转自： https://www.ie81.com/Technology/225.html