.NET 2.0 SmtpClient，发送邮件失败.

本文介绍了.NET 2.0 SmtpClient，发送邮件失败.的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

大家好，

我正在使用 SMTP类将电子邮件发送给客户端，我已经使用了两年多，没有任何问题.我们现在被转移到了新的电子邮件主机上，由于某种原因，尝试发送电子邮件时出现以下错误.

I''m using the SMTP classes to send emails out to clients,I''ve been using it for over 2 years without any problems.We have now switced over to a new email host and for some reason I get the following error when trying to send an email.

发送邮件失败.

System.FormatException:Base-64字符数组的无效长度.在System.Convert.FromBase64String(String s)在System.Net.NTAuthentication.GetOutgoingBlob(String incomingBlob)在System .Net.Mail.SmtpNtlmAuthenticationModule.Authenticate(字符串挑战，NetworkCredential凭据，Object sessionCookie)

System.FormatException: Invalid length for a Base-64 char array.at System.Convert.FromBase64String(String s)at System.Net.NTAuthentication.GetOutgoingBlob(String incomingBlob)at System.Net.Mail.SmtpNtlmAuthenticationModule.Authenticate(String challenge, NetworkCredential credential, Object sessionCookie)

有什么想法可能导致此问题吗?我只解析主机名，端口号，用户名和密码.所有值都是字符串，当然端口是整数.

Any ideas what might be causing this problem ? I''m only parsing the host name,port number,username and password.All values are string except of course for the port which is an int.

使用Visual C#2.0.

Using Visual C# 2.0.

在此先感谢所有帮助.

推荐答案

Hi 此问题是否每次还是仅持续存在?

HiDoes this problem persist everytime or only from time to time?

嘿，大家好，

Hey Guys,

我在以下链接上找到了解决方案

I found a solution on the following link

blogs.msdn/knom/archive/2008/04/16 /hacking-system-net-mail-smtpclient.aspx

blogs.msdn/knom/archive/2008/04/16/hacking-system-net-mail-smtpclient.aspx

似乎是底层的身份验证模块.在默认使用NTLM的smtpClient中，可以通过反射来覆盖"值.

Seems to be the underlaying authentication modules in the smtpClient that would be default use NTLM,by using reflection you can "override" the values.

//指定链接中的示例

// Example in specified link

FieldInfo transport = _client.GetType().GetField(运输" ， BindingFlags . BindingFlags .Instance); FieldInfo authModules = transport.GetValue(_client).GetType() .GetField("authenticationModules" ， BindingFlags . BindingFlags .Instance);

FieldInfo transport = _client.GetType().GetField("transport", BindingFlags.NonPublic | BindingFlags.Instance); FieldInfo authModules = transport.GetValue(_client).GetType() .GetField("authenticationModules", BindingFlags.NonPublic | BindingFlags.Instance);

Array modulesArray = authModules.GetValue(transport.GetValue(_client))如 数组; modulesArray.SetValue(modulesArray.GetValue(2)，0); modulesArray.SetValue(modulesArray.GetValue(2)，1); modulesArray.SetValue(modulesArray.GetValue(2)，3);

Array modulesArray = authModules.GetValue(transport.GetValue(_client)) as Array; modulesArray.SetValue(modulesArray.GetValue(2), 0); modulesArray.SetValue(modulesArray.GetValue(2), 1); modulesArray.SetValue(modulesArray.GetValue(2), 3);

在我的代码中，我做了以上所有操作，唯一的区别是我只替换了元素1中的元素数组，并使其值与元素3中的值相同，该值将为"Login".这对我有用，我希望它可以帮助遇到相同问题但又不至偶然发现链接的其他人.

In my code I did all the above,only difference is that I only replaced element number 1 in the array and made the value the same as the value in element 3 which would be "Login".This worked for me and I hope it will help someone else with the same problem that was not as lucky as to stumble on to the link.

//我在代码中所做的事情

// What I did in my code

modulesArray.SetValue(modulesArray.GetValue(3)，1);

modulesArray.SetValue(modulesArray.GetValue(3), 1);

亲切问候，

FREDDIE.