通过mailto标签和SMTP协议两种方式发送邮件
using System; using System.Collections.Generic; using System.Net.Mail; using System.Text; namespace WUtility.ToolHelper { public class EmailHelper { //格式：mailto:发件人地址 //格式：mailto:发件人地址?subject=邮件主题 //格式：mailto:发件人地址?cc=抄送地址&subject=邮件主题 //格式：mailto:发件人地址?bcc=密送地址 //格式：mailto:发件人地址?body=邮件内容 //格式：mailto:发件人地址1,发件地址2,发件地址3(以逗号分隔) [以逗号分隔可能邮箱不识别（稍等一会，或者在邮箱中点击下），可以分号分隔] //格式：mailto:发件人地址1,发件人地址2?cc=抄送地址&bcc=密送地址&subject=主题&body=邮件内容 //body中%0a%0d用于换行（只用一个就可以） //e.x. ******%0a%0d****** //输出：****** // ****** /// <summary> /// 调用默认工具发送Email /// </summary> /// <param name="sendTo">接收人,可多个以逗号分隔</param> /// <param name="cc">抄送人</param> /// <param name="bcc">密送地址</param> /// <param name="subject">主题</param> /// <param name="body">内容</param> public static void DefaultSendMailTo(string sendTo = " ", string cc = " ", string bcc = " ", string subject = " ", string body = " ") { string message = string.Format("mailto:{0}?cc={1}&bcc={2}&subject={3}&body={4}", sendTo ?? " ", cc ?? " ", bcc ?? " ", subject ?? " ", body ?? " "); System.Diagnostics.Process.Start(message);//调用进程启动邮件 } /// <summary> /// 发送邮件 /// </summary> /// <param name="userEmailAddress">发件人地址</param> /// <param name="userName">发件人姓名(可为空)</param> /// <param name="password">密码</param> /// <param name="host">邮件服务器地址</param> /// <param name="port"></param> /// <param name="sendToList">收件人(多个电子邮件地址之间必须用逗号字符（“,”）分隔)</param> /// <param name="sendCCList">抄送人(多个电子邮件地址之间必须用逗号字符（“,”）分隔)</param> /// <param name="subject">主题</param> /// <param name="body">内容</param> /// <param name="attachmentsPath">附件路径</param> /// <param name="errorMessage">错误信息</param> public static bool SendMessage(string userEmailAddress, string userName, string password, string host, int port, string[] sendToList, string[] sendCCList, string subject, string body, string[] attachmentsPath, out string errorMessage) { errorMessage = string.Empty; SmtpClient client = new SmtpClient(); //注意：一定要先设置 EnableSsl和UseDefaultCredentials，再实例化Credentials client.EnableSsl = false; client.UseDefaultCredentials = true; client.Credentials = new System.Net.NetworkCredential(userEmailAddress, password);//用户名、密码 client.DeliveryMethod = SmtpDeliveryMethod.Network;//指定电子邮件发送方式 client.Host = host;//邮件服务器 client.Port = port;//端口号 非SSL方式，默认端口号为：25 MailMessage msg = new MailMessage(); //加发件人 foreach (string send in sendToList) { msg.To.Add(send); } //加抄送 if (sendCCList != null) { foreach (string cc in sendCCList) { msg.To.Add(cc); } } //在有附件的情况下添加附件 if (attachmentsPath != null && attachmentsPath.Length > 0) { foreach (string path in attachmentsPath) { var attachFile = new Attachment(path); msg.Attachments.Add(attachFile); } } msg.From = new MailAddress(userEmailAddress, userName);//发件人地址 msg.Subject = subject;//邮件标题 msg.Body = body;//邮件内容 msg.BodyEncoding = System.Text.Encoding.UTF8;//邮件内容编码 msg.IsBodyHtml = true;//是否是HTML邮件 msg.Priority = MailPriority.High;//邮件优先级 try { client.Send(msg); return true; } catch (System.Net.Mail.SmtpException ex) { errorMessage = ex.Message; return false; } } } }
使用示例：
private void button16_Click(object sender, EventArgs e) { string szSendTo = "1234@qq.com;12345@qq.com"; string szCC = "123456@163.com;1234567@qq.com"; string szBcc = "12345678@qq.com"; string szSubject = "测试主题"; string body = "******今天天气不错哦，%0a%0d"; body += "据说明天天气也不错哦"; EmailHelper.DefaultSendMailTo(szSendTo, szCC, szBcc, szSubject, body); } private void button17_Click(object sender, EventArgs e) { var msg = "content"; string errorMsg; EmailHelper.SendMessage("aisa@qq.com", "aisa@qq.com", "123456", "smtp.qq.com", 25, new[] { "123456@qq.com" }, null, "测试Subject", msg, null, out errorMsg); }