.NET 发送邮件(C#)

最新推荐文章于 2025-09-11 14:04:08 发布

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#.net #c# #string #credentials #file #network

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本文介绍如何通过配置web.config文件实现邮件发送功能，并提供了一段示例代码来展示如何使用.NET框架进行邮件发送。文中还提到了使用第三方SMTP服务器如163邮箱时的注意事项。

配置web.config，当然这配置文件非必须的，你可以直接写在Code中，但是这样对以后维护比较麻烦。

首先看一下配置文件：(从mailSettings开始)

<system.net> <configuration> .... ....  <mailSettings> <smtp deliveryMethod="Network" from="changxxx@163.com"> <network host="smtp.163.com" port="25" userName="changxxx@163.com" password="xxxxx"/> </smtp> </mailSettings> </system.net> </configuration>

引入两个命名空间：

using System.Web.Configuration; using System.Net.Configuration;

主要发送函数代码：(稍微修改就可以为你所用了)

public void sendMail(string subject, string body) { Configuration config = WebConfigurationManager.OpenWebConfiguration(HttpContext.Current.Request.ApplicationPath); MailSettingsSectionGroup settings = (MailSettingsSectionGroup)config.GetSectionGroup("system.net/mailSettings"); string username = settings.Smtp.Network.UserName; string password = settings.Smtp.Network.Password; string smtpserver = settings.Smtp.Network.Host; string frommail = settings.Smtp.From; string tomail = settings.Smtp.From; MailAddress EmailFrom = new MailAddress(frommail); MailAddress EmailTo = new MailAddress(tomail); MailMessage Email = new MailMessage(EmailFrom, EmailTo); Email.Priority = MailPriority.High; Email.Subject = subject; Email.Body = body; //添加抄送电子邮件 //Email.CC.Add("这里就是你发送邮件的目标拉,填写抄送收件人的邮件地址"); // string file = Server.MapPath("d://") + "vs2008 key.txt";//附件路径 // Attachment data = new Attachment(file,System.Net.Mime.MediaTypeNames.Application.Octet); // Add time stamp information for the file. // System.Net.Mime.ContentDisposition disposition = data.ContentDisposition; // disposition.CreationDate = System.IO.File.GetCreationTime(file); // disposition.ModificationDate = System.IO.File.GetLastWriteTime(file); // disposition.ReadDate = System.IO.File.GetLastAccessTime(file); // Add the file attachment to this e-mail message. // Email.Attachments.Add(data); SmtpClient Client = new SmtpClient(smtpserver); //验证 (Credentials 凭证) Client.Credentials = new System.Net.NetworkCredential(username, password); //处理待发的电子邮件的方法 (Delivery 发送,传输) Client.DeliveryMethod = SmtpDeliveryMethod.Network; try { Client.Send(Email); Response.Write("已发送成功啦"); Response.Redirect("send_mail_success.html"); } catch (SmtpFailedRecipientsException ex) { for (int i = 0; i < ex.InnerExceptions.Length; i++) { SmtpStatusCode status = ex.InnerExceptions[i].StatusCode; if (status == SmtpStatusCode.MailboxBusy || status == SmtpStatusCode.MailboxUnavailable) { Response.Write("Delivery failed - retrying in 5 seconds."); System.Threading.Thread.Sleep(5000); Client.Send(Email); } else { Response.Write("Failed to deliver message to {0}" + ex.FailedRecipient[i].ToString().Trim() + ""); Response.Redirect("send_mail_fail.html"); } } } }

奇怪的是，我用QQ邮箱时不行，不知道为什么，SMTP都开通，而且之前用PHP SMTP时发送也成功，如果你用QQ邮箱不行，请更换为网易的试试。