MailKit开源地址：https://github.com/jstedfast/MailKit
using System;
using System.IO;
using MailKit.Net.Smtp;
using MimeKit;
using MimeKit.Text;
namespace commom
{
public class EmailHelper
{
//Nuget包管理添加Mailkit
/// <summary>
/// 服务邮箱
/// </summary>
private string _STEPNAME = "smtp.qq.com";
/// <summary>
/// 服务邮箱端口
/// </summary>
private int _STEPPORT = 587;
/// <summary>
/// 发送方邮箱
/// </summary>
private string _USEREMAIL;
/// <summary>
/// 发送方邮箱Smtp授权码
/// </summary>
private string _PASSWORD;
/// <summary>
/// 发送方邮箱归属人，昵称
/// </summary>
private string _EMAILBLONGER;
private string email;
private string emailBlonger;
private string smtp;
/// <summary>
/// 邮箱配置
/// </summary>
/// <param name="email"></param>
/// <param name="smtp"></param>
public EmailHelper(string email, string smtp)
{
this._USEREMAIL = email;
this._PASSWORD = smtp;
}
public EmailHelper(string email, string emailBlonger, string smtp)
{
this._USEREMAIL = email;
this._PASSWORD = smtp;
this._EMAILBLONGER = emailBlonger;
}
/// <summary>
/// 邮箱发送类
/// </summary>
/// <param name="toEmaill">发送方邮箱</param>
/// <param name="toEmailBlonger">发送方名称</param>
/// <param name="subject">邮件标题</param>
/// <param name="text">发送的文字内容</param>
/// <param name="html">发送的html内容</param>
/// <param name="path">发送的附件,找不到的就自动过滤</param>
/// <returns></returns>
public string SendEmail(string toEmaill, string toEmailBlonger, string subject, string text, string html, string path)
{
try
{
MimeMessage message = new MimeMessage();
//发送方
message.From.Add(new MailboxAddress(this._EMAILBLONGER, this._USEREMAIL));
//接受方
message.To.Add(new MailboxAddress(toEmailBlonger, toEmaill));
//标题
message.Subject = subject;
//创建附件
var multipart = new Multipart("mixed");
//文字内容
if (!string.IsNullOrEmpty(text))
{
var plain = new TextPart(TextFormat.Plain)
{
Text = text
};
multipart.Add(plain);
}
//html内容
if (!string.IsNullOrEmpty(html))
{
var Html = new TextPart(TextFormat.Html)
{
Text = html
};
multipart.Add(Html);
}
if (!string.IsNullOrEmpty(path))
{
var pathList = path.Split(';');
foreach (var p in pathList)
{
try
{
if (!string.IsNullOrEmpty(p.Trim()))
{
var attimg = new MimePart()
{//"image", "png"方法里带参数的话
ContentObject = new ContentObject(File.OpenRead(p), ContentEncoding.Default),
ContentDisposition = new ContentDisposition(ContentDisposition.Attachment),
ContentTransferEncoding = ContentEncoding.Base64,
FileName = Path.GetFileName(path)
};
multipart.Add(attimg);
}
}
catch (FileNotFoundException ex)
{
//找不到文件就不提交附件了
}
}
}
//赋值邮件内容
message.Body = multipart;
//开始发送
using (var client = new SmtpClient())
{
client.Connect(this._STEPNAME, this._STEPPORT, false);
client.Authenticate(this._USEREMAIL, this._PASSWORD);
client.Send(message);
client.Disconnect(true);
}
return "邮件发送成功";
}
catch (Exception)
{
return "邮箱发送失败";
}
}
/// <summary>
/// 邮箱发送类，不用输入用户昵称的
/// </summary>
/// <param name="toEmaill">发送方邮箱</param>
/// <param name="toEmailBlonger">发送方名称</param>
/// <param name="subject">邮件标题</param>
/// <param name="text">发送的文字内容</param>
/// <param name="html">发送的html内容</param>
/// <param name="path">发送的附件，多附件用;隔开</param>
/// <returns></returns>
public void SendEmail(string toEmaill, string subject, string text, string html, string path)
{
try
{
MimeMessage message = new MimeMessage();
//发送方
message.From.Add(new MailboxAddress(this._USEREMAIL));
//接受方
message.To.Add(new MailboxAddress(toEmaill));
//标题
message.Subject = subject;
//创建附件
var multipart = new Multipart("mixed");
//文字内容
if (!string.IsNullOrEmpty(text))
{
var plain = new TextPart(TextFormat.Plain)
{
Text = text
};
multipart.Add(plain);
}
//html内容
if (!string.IsNullOrEmpty(html))
{
var Html = new TextPart(TextFormat.Html)
{
Text = html
};
multipart.Add(Html);
}
if (!string.IsNullOrEmpty(path))
{//修改为多附件，
var pathList = path.Split(';');
foreach (var p in pathList)
{
try
{
if (!string.IsNullOrEmpty(p.Trim()))
{
var attimg = new MimePart()
{//"image", "png"方法里带参数的话
ContentObject = new ContentObject(File.OpenRead(p), ContentEncoding.Default),
ContentDisposition = new ContentDisposition(ContentDisposition.Attachment),
ContentTransferEncoding = ContentEncoding.Base64,
FileName = Path.GetFileName(path)
};
multipart.Add(attimg);
}
}
catch (FileNotFoundException ex)
{
//找不到文件就不提交附件了
}
}
}
//赋值邮件内容
message.Body = multipart;
//开始发送
using (var client = new SmtpClient())
{
client.Connect(this._STEPNAME, this._STEPPORT, false);
client.Authenticate(this._USEREMAIL, this._PASSWORD);
client.Send(message);
client.Disconnect(true);
}
// return "邮件发送成功";
}
catch (Exception ex)
{
// return "邮箱发送失败";
}
}
}
/// <summary>
/// 测试调用方法
/// </summary>
public class Test{
private email=new EmailHelper("发送的邮箱","Smtp授权码");
public void SendEmail()
{
email.SendEmail("对方的邮箱", "对方邮箱名称也可以是邮箱","标题", "内容", "<b>这是html标记的文本</b>", "附加地址")
}
}
}
附件问题处理
List<FileStream> list = new List<FileStream>(attachments.Count());
foreach (var path in attachments)
{
if (!File.Exists(path))
{
throw new FileNotFoundException("文件未找到", path);
}
var fileName = Path.GetFileName(path);
var fileType = MimeTypes.GetMimeType(path);
var contentTypeArr = fileType.Split('/');
var contentType = new ContentType(contentTypeArr[0], contentTypeArr[1]);
MimePart attachment = null;
var fs = new FileStream(path, FileMode.Open);
list.Add(fs);
attachment = new MimePart(contentType)
{
Content = new MimeContent(fs),
ContentDisposition = new ContentDisposition(ContentDisposition.Attachment),
ContentTransferEncoding = ContentEncoding.Base64,
};
var charset = "GB18030";
attachment.ContentType.Parameters.Add(charset, "name", fileName);
attachment.ContentDisposition.Parameters.Add(charset, "filename", fileName);
foreach (var param in attachment.ContentDisposition.Parameters)
param.EncodingMethod = ParameterEncodingMethod.Rfc2047;
foreach (var param in attachment.ContentType.Parameters)
param.EncodingMethod = ParameterEncodingMethod.Rfc2047;
collection.Add(attachment);
}
await SendEmail(body, subject, isHtml, to, cc, collection);
foreach (var fs in list)
{
fs.Dispose();//手动释放
}
解决文件名不能使用中文
原因是字符编码的问题
MimePart attachment = null;
var fs = new FileStream(path, FileMode.Open);
list.Add(fs);
attachment = new MimePart(contentType)
{
Content = new MimeContent(fs),
ContentDisposition = new ContentDisposition(ContentDisposition.Attachment),
ContentTransferEncoding = ContentEncoding.Base64,
};
var charset = "GB18030";
attachment.ContentType.Parameters.Add(charset, "name", fileName);
attachment.ContentDisposition.Parameters.Add(charset, "filename", fileName);
解决附件名字中文乱码主要依靠最后三行代码，将name和filename的字符集指定为GB18030即可。
解决文件名不能超过41字符
var attachment = bodyBuilder.Attachments.Add (.....);
foreach (var param in attachment.ContentDisposition.Parameters)
param.EncodingMethod = ParameterEncodingMethod.Rfc2047;
foreach (var param in attachment.ContentType.Parameters)
param.EncodingMethod = ParameterEncodingMethod.Rfc2047;