背景
由于smtpClient发送邮件偶发出现超时的情况，而且4.7版本后被标志为已过时，故换成MailKit方式。
https://docs.microsoft.com/en-us/dotnet/api/system.net.mail.smtpclient?view=netframework-4.7.1
MailKit源码地址：https://github.com/jstedfast/MailKit
实现
示例demo地址：MailKitDemo
1、引包
创建MailKitDemo项目，安装nuget包，示例版本是3.1.1
2、MailHelper
封装MailHelper方法类，提供连接、授权、日志等操作。
public static class MailHelper
{
/// <summary>
/// 发送邮件
/// </summary>
/// <param name="mailBodyEntity">邮件基础信息</param>
/// <param name="sendServerConfiguration">发件人基础信息</param>
public static SendResultEntity SendMail(MailBodyEntity mailBodyEntity,
SendServerConfigurationEntity sendServerConfiguration)
{
if (mailBodyEntity == null)
{
throw new ArgumentNullException();
}
if (sendServerConfiguration == null)
{
throw new ArgumentNullException();
}
var sendResultEntity = new SendResultEntity();
using (var client = new SmtpClient(new ProtocolLogger(MailMessage.CreateMailLog())))
{
client.ServerCertificateValidationCallback = (s, c, h, e) => true;
Connection(mailBodyEntity, sendServerConfiguration, client, sendResultEntity);
if (sendResultEntity.ResultStatus == false)
{
return sendResultEntity;
}
SmtpClientBaseMessage(client);
// Note: since we don't have an OAuth2 token, disable
// the XOAUTH2 authentication mechanism.
client.AuthenticationMechanisms.Remove("XOAUTH2");
Authenticate(mailBodyEntity, sendServerConfiguration, client, sendResultEntity);
if (sendResultEntity.ResultStatus == false)
{
return sendResultEntity;
}
Send(mailBodyEntity, sendServerConfiguration, client, sendResultEntity);
if (sendResultEntity.ResultStatus == false)
{
return sendResultEntity;
}
client.Disconnect(true);
}
return sendResultEntity;
}
/// <summary>
/// 连接服务器
/// </summary>
/// <param name="mailBodyEntity">邮件内容</param>
/// <param name="sendServerConfiguration">发送配置</param>
/// <param name="client">客户端对象</param>
/// <param name="sendResultEntity">发送结果</param>
private static void Connection(MailBodyEntity mailBodyEntity, SendServerConfigurationEntity sendServerConfiguration,
SmtpClient client, SendResultEntity sendResultEntity)
{
try
{
client.Connect(sendServerConfiguration.SmtpHost, sendServerConfiguration.SmtpPort);
}
catch (SmtpCommandException ex)
{
sendResultEntity.ResultInformation = $"尝试连接时出错:{0}" + ex.Message;
sendResultEntity.ResultStatus = false;
}
catch (SmtpProtocolException ex)
{
sendResultEntity.ResultInformation = $"尝试连接时的协议错误:{0}" + ex.Message;
sendResultEntity.ResultStatus = false;
}
catch (Exception ex)
{
sendResultEntity.ResultInformation = $"服务器连接错误:{0}" + ex.Message;
sendResultEntity.ResultStatus = false;
}
}
/// <summary>
/// 账户认证
/// </summary>
/// <param name="mailBodyEntity">邮件内容</param>
/// <param name="sendServerConfiguration">发送配置</param>
/// <param name="client">客户端对象</param>
/// <param name="sendResultEntity">发送结果</param>
private static void Authenticate(MailBodyEntity mailBodyEntity, SendServerConfigurationEntity sendServerConfiguration,
SmtpClient client, SendResultEntity sendResultEntity)
{
try
{
client.Authenticate(sendServerConfiguration.SenderAccount, sendServerConfiguration.SenderPassword);
}
catch (AuthenticationException ex)
{
sendResultEntity.ResultInformation = $"无效的用户名或密码:{0}" + ex.Message;
sendResultEntity.ResultStatus = false;
}
catch (SmtpCommandException ex)
{
sendResultEntity.ResultInformation = $"尝试验证错误:{0}" + ex.Message;
sendResultEntity.ResultStatus = false;
}
catch (SmtpProtocolException ex)
{
sendResultEntity.ResultInformation = $"尝试验证时的协议错误:{0}" + ex.Message;
sendResultEntity.ResultStatus = false;
}
catch (Exception ex)
{
sendResultEntity.ResultInformation = $"账户认证错误:{0}" + ex.Message;
sendResultEntity.ResultStatus = false;
}
}
/// <summary>
/// 发送邮件
/// </summary>
/// <param name="mailBodyEntity">邮件内容</param>
/// <param name="sendServerConfiguration">发送配置</param>
/// <param name="client">客户端对象</param>
/// <param name="sendResultEntity">发送结果</param>
private static void Send(MailBodyEntity mailBodyEntity, SendServerConfigurationEntity sendServerConfiguration,
SmtpClient client, SendResultEntity sendResultEntity)
{
try
{
client.Send(MailMessage.AssemblyMailMessage(mailBodyEntity));
}
catch (SmtpCommandException ex)
{
switch (ex.ErrorCode)
{
case SmtpErrorCode.RecipientNotAccepted:
sendResultEntity.ResultInformation = $"收件人未被接受:{ex.Message}";
break;
case SmtpErrorCode.SenderNotAccepted:
sendResultEntity.ResultInformation = $"发件人未被接受:{ex.Message}";
break;
case SmtpErrorCode.MessageNotAccepted:
sendResultEntity.ResultInformation = $"消息未被接受:{ex.Message}";
break;
}
sendResultEntity.ResultStatus = false;
}
catch (SmtpProtocolException ex)
{
sendResultEntity.ResultInformation = $"发送消息时的协议错误:{ex.Message}";
sendResultEntity.ResultStatus = false;
}
catch (Exception ex)
{
sendResultEntity.ResultInformation = $"邮件接收失败:{ex.Message}";
sendResultEntity.ResultStatus = false;
}
}
/// <summary>
/// 获取SMTP基础信息
/// </summary>
/// <param name="client">客户端对象</param>
/// <returns></returns>
private static MailServerInformation SmtpClientBaseMessage(SmtpClient client)
{
var mailServerInformation = new MailServerInformation
{
Authentication = client.Capabilities.HasFlag(SmtpCapabilities.Authentication),
BinaryMime = client.Capabilities.HasFlag(SmtpCapabilities.BinaryMime),
Dsn = client.Capabilities.HasFlag(SmtpCapabilities.Dsn),
EightBitMime = client.Capabilities.HasFlag(SmtpCapabilities.EightBitMime),
Size = client.MaxSize
};
return mailServerInformation;
}
}
主程序调用
static void Main(string[] args)
{
var mailServerConfig = new SendServerConfigurationEntity()
{
SmtpPort = 0, //SMTP端口
IsSsl = true, //启用Ssl
SenderAccount = "****@qq.com", //发件人
SmtpHost = "smtp.qq.com", //邮件Smtp服务，QQ：smtp.qq.com
SenderPassword = "****", //邮箱授权码
};
var mailBodyEntity = new MailBodyEntity()
{
Subject = "标题",
Body = "邮件内容：<BR>百度：<a href='http://www.baidu.com'>点我</a>",
Recipients = new List<string>() { "***@163.com"}, //收件人
SenderAddress = "****@qq.com", //发件人
};
var result = MailHelper.SendMail(mailBodyEntity, mailServerConfig);
}
配置项UI如下：
3、效果及日志
日志：
邮件服务配置
1、网易个人/VIP邮箱
开启SMTP服务
该授权码对应 EmailRequest中的Password
网易个人邮箱/VIP邮箱的smtp地址：smtp.163.com
网易个人邮箱/VIP邮箱的smtp端口: 465
2、网易企业邮箱
网易企业邮箱不需要生成授权码，Password使用邮箱的登录密码即可
网易企业邮箱的smtp：smtp.ym.163.com
网易企业邮箱的smtp端口号：465
注意：网易企业邮箱的smtp不一定是smtp.ym.163.com，可以参考：https://qiye.163.com/help/client-profile.html
3、outlook个人邮箱
outlook个人邮箱smtp服务器是：smtp-mail.outlook.com
outlook个人邮箱smtp端口号是：587
Password是登录outlook邮箱的密码
4、QQ个人邮箱
QQ个人邮箱的流程类似网易个人邮箱，都需要生成授权码
QQ个人邮箱的smtp地址是：smtp.qq.com
QQ个人邮箱的smtp端口号是：465
QQ个人邮箱的Password是上面的申请的授权码