如何在 ASP.NET C# 中发送电子邮件
Posted
技术标签:
【中文标题】如何在 ASP.NET C# 中发送电子邮件【英文标题】：How to send email in ASP.NET C# 【发布时间】：2013-08-22 00:19:32 【问题描述】：我对@987654321@ C# 领域非常陌生。我打算通过 ASP.NET C# 发送邮件，这是来自我的ISP 的SMTP 地址：
smtp-proxy.tm.net.my
以下是我尝试做的，但失败了。
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="SendMail" %>
<html>
<head id="Head1" runat="server"><title>Email Test Page</title></head>
<body>
<form id="form1" runat="server">
Message to: <asp:TextBox ID="txtTo" runat="server" /><br>
Message from: <asp:TextBox ID="txtFrom" runat="server" /><br>
Subject: <asp:TextBox ID="txtSubject" runat="server" /><br>
Message Body:<br>
<asp:TextBox ID="txtBody" runat="server" Height="171px" TextMode="MultiLine" Width="270px" /><br>
<asp:Button ID="Btn_SendMail" runat="server" onclick="Btn_SendMail_Click" Text="Send Email" /><br>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</form>
</body>
</html>
下面是我的code-behind：
using System;
using System.Web.UI.WebControls;
using System.Net.Mail;
public partial class SendMail : System.Web.UI.Page
protected void Btn_SendMail_Click(object sender, EventArgs e)
MailMessage mailObj = new MailMessage(
txtFrom.Text, txtTo.Text, txtSubject.Text, txtBody.Text);
SmtpClient SMTPServer = new SmtpClient("127.0.0.1");
try
SMTPServer.Send(mailObj);
catch (Exception ex)
Label1.Text = ex.ToString();
PS：很抱歉，我无法理解接收方/发送方 SMTP 概念，因此我试图从这里理解整个概念。
【问题讨论】：
当你点击按钮时，它会到达后面的代码吗？ 您是否在 localhost 的 IIS 中设置了 smtp？失败是什么？您有 ISP 的邮件帐户吗？ 【参考方案1】：只需通过下面的代码。
SmtpClient smtpClient = new SmtpClient("mail.MyWebsiteDomainName.com", 25);
smtpClient.Credentials = new System.Net.NetworkCredential("info@MyWebsiteDomainName.com", "myIDPassword");
// smtpClient.UseDefaultCredentials = true; // uncomment if you don't want to use the network credentials
smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
smtpClient.EnableSsl = true;
MailMessage mail = new MailMessage();
//Setting From , To and CC
mail.From = new MailAddress("info@MyWebsiteDomainName", "MyWeb Site");
mail.To.Add(new MailAddress("info@MyWebsiteDomainName"));
mail.CC.Add(new MailAddress("MyEmailID@gmail.com"));
smtpClient.Send(mail);
【讨论】：
Thamotharan's 是正确的。发送纯文本或 HTML 正文。对于快速而肮脏的普通电子邮件。这是在邮件正文中嵌入 HTML 标记的一个很好的示例。 Inline HTML code。 StringBuilder 对于创建更大的消息非常有用。还有 我发现这很有帮助。根据文档，虽然将 UseDefaultCredentials 设置为 true 意味着将不会发送给定的凭据。这是要弄清楚的棘手部分。 请注意，MailMessage 和 SmtpClient 都实现了 IDisposable 并且应该在 using 语句中使用（或以其他方式处理）
可能需要配置一个gmail账号，如下。 “不太安全的应用程序”的值应设置为“启用”。在客户端使用域“smtp.gmail.com”和端口 587。【参考方案2】：
尝试改用此代码。注意：在“发件人地址”中提供正确的电子邮件 ID 和密码。
protected void btn_send_Click(object sender, EventArgs e)
System.Net.Mail.MailMessage mail = new System.Net.Mail.MailMessage();
mail.To.Add("to gmail address");
mail.From = new MailAddress("from gmail address", "Email head", System.Text.Encoding.UTF8);
mail.Subject = "This mail is send from asp.net application";
mail.SubjectEncoding = System.Text.Encoding.UTF8;
mail.Body = "This is Email Body Text";
mail.BodyEncoding = System.Text.Encoding.UTF8;
mail.IsBodyHtml = true;
mail.Priority = MailPriority.High;
SmtpClient client = new SmtpClient();
client.Credentials = new System.Net.NetworkCredential("from gmail address", "your gmail account password");
client.Port = 587;
client.Host = "smtp.gmail.com";
client.EnableSsl = true;
try
client.Send(mail);
Page.RegisterStartupScript("UserMsg", "<script>alert('Successfully Send...');if(alert) window.location='SendMail.aspx';</script>");
catch (Exception ex)
Exception ex2 = ex;
string errorMessage = string.Empty;
while (ex2 != null)
errorMessage += ex2.ToString();
ex2 = ex2.InnerException;
Page.RegisterStartupScript("UserMsg", "<script>alert('Sending Failed...');if(alert) window.location='SendMail.aspx';</script>");
【讨论】：
所以我在我的 ASP.net 页面中设置了一个带有下拉列表/文本框的表单。它会以同样的方式工作吗？谢谢。 这段代码在本地服务器机器人上运行，而不是来自托管老爹服务器。为什么？【参考方案3】：你可以像这样使用 hotmail 试试这个：-
MailMessage o = new MailMessage("From", "To","Subject", "Body");
NetworkCredential netCred= new NetworkCredential("Sender Email","Sender Password");
SmtpClient smtpobj= new SmtpClient("smtp.live.com", 587);
smtpobj.EnableSsl = true;
smtpobj.Credentials = netCred;
smtpobj.Send(o);
【讨论】：
【参考方案4】：尝试以下方法：
try
var fromEmailAddress = ConfigurationManager.AppSettings["FromEmailAddress"].ToString();
var fromEmailDisplayName = ConfigurationManager.AppSettings["FromEmailDisplayName"].ToString();
var fromEmailPassword = ConfigurationManager.AppSettings["FromEmailPassword"].ToString();
var smtpHost = ConfigurationManager.AppSettings["SMTPHost"].ToString();
var smtpPort = ConfigurationManager.AppSettings["SMTPPort"].ToString();
string body = "Your registration has been done successfully. Thank you.";
MailMessage message = new MailMessage(new MailAddress(fromEmailAddress, fromEmailDisplayName), new MailAddress(ud.LoginId, ud.FullName));
message.Subject = "Thank You For Your Registration";
message.IsBodyHtml = true;
message.Body = body;
var client = new SmtpClient();
client.Credentials = new NetworkCredential(fromEmailAddress, fromEmailPassword);
client.Host = smtpHost;
client.EnableSsl = true;
client.Port = !string.IsNullOrEmpty(smtpPort) ? Convert.ToInt32(smtpPort) : 0;
client.Send(message);
catch (Exception ex)
throw (new Exception("Mail send failed to loginId " + ud.LoginId + ", though registration done."));
然后在你的 web.config 中添加以下内容
<!--Email Config-->
<add key="FromEmailAddress" value="sender emailaddress"/>
<add key="FromEmailDisplayName" value="Display Name"/>
<add key="FromEmailPassword" value="sender Password"/>
<add key="SMTPHost" value="smtp-proxy.tm.net.my"/>
<add key="SMTPPort" value="smptp Port"/>
【讨论】：
【参考方案5】：你可以试试 MailKit MailKit 是一个开源跨平台 .NET 邮件客户端库，它基于 MimeKit 并针对移动设备进行了优化。您可以在您的应用程序中轻松使用。您可以从here下载。
MimeMessage mailMessage = new MimeMessage();
mailMessage.From.Add(new MailboxAddress(fromName, from@address.com));
mailMessage.Sender = new MailboxAddress(senderName, sender@address.com);
mailMessage.To.Add(new MailboxAddress(emailid, emailid));
mailMessage.Subject = subject;
mailMessage.ReplyTo.Add(new MailboxAddress(replyToAddress));
mailMessage.Subject = subject;
var builder = new BodyBuilder();
builder.TextBody = "Hello There";
try
using (var smtpClient = new SmtpClient())
smtpClient.Connect("HostName", "Port", MailKit.Security.SecureSocketOptions.None);
smtpClient.Authenticate("user@name.com", "password");
smtpClient.Send(mailMessage);
Console.WriteLine("Success");
catch (SmtpCommandException ex)
Console.WriteLine(ex.ToString());
catch (Exception ex)
Console.WriteLine(ex.ToString());
【讨论】：
【参考方案6】：检查一下....它有效
http://www.aspnettutorials.com/tutorials/email/email-aspnet2-csharp/
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Net.Mail;
public partial class _Default : System.Web.UI.Page
protected void Page_Load(object sender, EventArgs e)
protected void btnSubmit_Click(object sender, EventArgs e)
try
MailMessage message = new MailMessage(txtFrom.Text, txtTo.Text, txtSubject.Text, txtBody.Text);
SmtpClient emailClient = new SmtpClient(txtSMTPServer.Text);
emailClient.Send(message);
litStatus.Text = "Message Sent";
catch (Exception ex)
litStatus.Text=ex.ToString();
【讨论】：
以上链接无效，您可以在此处查看以asp net web-form发送电子邮件的分步指南：qawithexperts.com/article/asp-net/…【参考方案7】：只传参数 喜欢 body - 来自客户的内容（查询） 主题 - 邮件主题中定义的主题 用户名 - 没有任何名称 邮件 - 邮件（必填）
public static bool SendMail(String body, String subject, string username, String mail)
bool isSendSuccess = false;
try
var fromEmailAddress = ConfigurationManager.AppSettings["FromEmailAddress"].ToString();
var fromEmailDisplayName = ConfigurationManager.AppSettings["FromEmailDisplayName"].ToString();
var fromEmailPassword = ConfigurationManager.AppSettings["FromEmailPassword"].ToString();
var smtpHost = ConfigurationManager.AppSettings["SMTPHost"].ToString();
var smtpPort = ConfigurationManager.AppSettings["SMTPPort"].ToString();
MailMessage message = new MailMessage(new MailAddress(fromEmailAddress, fromEmailDisplayName),
new MailAddress(mail, username));
message.Subject = subject;
message.IsBodyHtml = true;
message.Body = body;
var client = new SmtpClient();
client.UseDefaultCredentials = false;
client.Credentials = new NetworkCredential(fromEmailAddress, fromEmailPassword);
client.Host = smtpHost;
client.EnableSsl = false;
client.Port = !string.IsNullOrEmpty(smtpPort) ? Convert.ToInt32(smtpPort) : 0;
client.Send(message);
isSendSuccess = true;
catch (Exception ex)
throw (new Exception("Mail send failed to loginId " + mail + ", though registration done."+ex.ToString()+"\n"+ex.StackTrace));
return isSendSuccess;
如果您使用 go daddy 服务器这项工作。在 web.config 中添加这个
<appSettings>
---other ---setting
<add key="FromEmailAddress" value="myemail@gmail.com" />
<add key="FromEmailDisplayName" value="anyname" />
<add key="FromEmailPassword" value="mypassword@" />
<add key="SMTPHost" value="relay-hosting.secureserver.net" />
<add key="SMTPPort" value="25" />
</appSettings>
如果您使用的是 localhost 或 vps 服务器，请将此配置更改为此
<appSettings>
---other ---setting
<add key="FromEmailAddress" value="myemail@gmail.com" />
<add key="FromEmailDisplayName" value="anyname" />
<add key="FromEmailPassword" value="mypassword@" />
<add key="SMTPHost" value="smtp.gmail.com" />
<add key="SMTPPort" value="587" />
</appSettings>
修改代码
client.EnableSsl = true;
如果您使用的是 gmail，请启用安全应用。使用此链接 https://myaccount.google.com/lesssecureapps?pli=1&rapt=AEjHL4Pd6h3XxE663Flvd-FfeRXxW_eNrIsGTBlZklgkAHZEeuHvheCQuZ1-djB9uIWaB-2EV7hyLCU0dWKA7D0JzYKe4ZRkuA
【讨论】：
【参考方案8】： using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Globalization;
using System.Text.RegularExpressions;
/// <summary>
/// Summary description for RegexUtilities
/// </summary>
public class RegexUtilities
bool InValid = false;
public bool IsValidEmail(string strIn)
InValid = false;
if (String.IsNullOrEmpty(strIn))
return false;
// Use IdnMapping class to convert Unicode domain names.
strIn = Regex.Replace(strIn, @"(@)(.+)$", this.DomainMapper);
if (InValid)
return false;
// Return true if strIn is in valid e-mail format.
return Regex.IsMatch(strIn, @"^(?("")(""[^""]+?""@)|(([0-9a-z]((\.(?!\.))|[-!#\$%&'\*\+/=\?\^`\\\|~\w])*)(?<=[0-9a-z])@))" + @"(?(\[)(\[(\d1,3\.)3\d1,3\])|(([0-9a-z][-\w]*[0-9a-z]*\.)+[a-z0-9]2,17))$",
RegexOptions.IgnoreCase);
private string DomainMapper(Match match)
// IdnMapping class with default property values.
IdnMapping idn = new IdnMapping();
string domainName = match.Groups[2].Value;
try
domainName = idn.GetAscii(domainName);
catch (ArgumentException)
InValid = true;
return match.Groups[1].Value + domainName;
private void GetSendEmInfo()
#region For Get All Type Email Informations..!!
IPL.DoId = ddlName.SelectedValue;
DataTable dt = IdBL.GetEmailS(IPL);
if (dt.Rows.Count > 0)
hid_MailId.Value = dt.Rows[0]["MailId"].ToString();
hid_UsedPName.Value = dt.Rows[0]["UName"].ToString();
hid_EmailSubject.Value = dt.Rows[0]["EmailSubject"].ToString();
hid_EmailBody.Value = dt.Rows[0]["EmailBody"].ToString();
hid_EmailIdName.Value = dt.Rows[0]["EmailIdName"].ToString();
hid_EmPass.Value = dt.Rows[0]["EPass"].ToString();
hid_SeName.Value = dt.Rows[0]["SenName"].ToString();
hid_TNo.Value = dt.Rows[0]["TeNo"].ToString();
hid_EmaLimit.Value = dt.Rows[0]["EmailLimit"].ToString();
hidlink.Value = dt.Rows[0][link"].ToString();
#endregion
#region For Set Some Local Variables..!!
int StartLmt, FinalLmt, SendCurrentMail;
StartLmt = FinalLmt = SendCurrentMail = 0;
bool Valid_LimitMail;
Valid_LimitMail = true;
/**For Get Finalize Limit For Send Mail**/
FinalLmt = Convert.ToInt32(hid_EmailmaxLimit.Value);
#region For Check Email Valid Limits..!!
if (FinalLmt > 0)
Valid_LimitMail = true;
else
Valid_LimitMail = false;
#endregion
/**For Get Finalize Limit For Send Mail**/
#endregion
if (Valid_LimitMail == true)
#region For Send Current Email Status..!!
bool EmaiValid;
string CreateFileName;
string retmailflg = null;
EmaiValid = false;
#endregion
#region For Set Start Limit And FinalLimit Send No Of Email..!!
mPL.SendDate = DateTime.Now.ToString("dd-MMM-yyyy");
DataTable dtsendEmail = m1BL.GetEmailSendLog(mPL);
if (dtsendEmail.Rows.Count > 0)
StartLmt = Convert.ToInt32(dtsendEmail.Rows[0]["SendNo_Of_Email"].ToString());
else
StartLmt = 0;
#endregion
#region For Find Grid View Controls..!!
for (int i = 0; i < GrdEm.Rows.Count; i++)
#region For Find Grid view Controls..!!
CheckBox Chk_SelectOne = (CheckBox)GrdEmp.Rows[i].FindControl("chkSingle");
Label lbl_No = (Label)GrdEmAtt.Rows[i].FindControl("lblGrdCode");
lblCode.Value = lbl_InNo.Text;
Label lbl_EmailId = (Label)GrdEomAtt.Rows[i].FindControl("lblGrdEmpEmail");
#endregion
/**Region For If Check Box Checked Then**/
if (Chk_SelectOne.Checked == true)
if (!string.IsNullOrEmpty(lbl_EmailId.Text))
#region For When Check Box Checked..!!
/**If Start Limit Less Or Equal To Then Condition Performs**/
if (StartLmt < FinalLmt)
StartLmt = StartLmt + 1;
else
Valid_LimitMail = false;
EmaiValid = false;
/**End Region**/
string[] SplitClients_Email = lbl_EmailId.Text.Split(',');
string Send_Email, Hold_Email;
Send_Email = Hold_Email = "";
int CountEmail;/**Region For Count Total Email**/
CountEmail = 0;/**First Time Email Counts Zero**/
Hold_Email = SplitClients_Email[0].ToString().Trim().TrimEnd().TrimStart().ToString();
/**Region For If Clients Have One Email**/
#region For First Emails Send On Client..!!
if (SplitClients_Email[0].ToString() != "")
if (EmailRegex.IsValidEmail(Hold_Email))
Send_Email = Hold_Email;
CountEmail = 1;
EmaiValid = true;
else
EmaiValid = false;
#endregion
/**Region For If Clients Have One Email**/
/**Region For If Clients Have Two Email**/
/**Region For If Clients Have Two Email**/
if (EmaiValid == true)
#region For Create Email Body And Create File Name..!!
//fofile = Server.MapPath("PDFs");
fofile = Server.MapPath("~/vvv/vvvv/") + "/";
CreateFileName = lbl_INo.Text.ToString() + "_1" + ".Pdf";/**Create File Name**/
string[] orimail = Send_Email.Split(',');
string Billbody, TempInvoiceId;
// DateTime dtLstdate = new DateTime(Convert.ToInt32(txtYear.Text), Convert.ToInt32(ddlMonth.SelectedValue), 16);
// DateTime IndtLmt = dtLstdate.AddMonths(1);
TempInvoiceId = "";
//byte[] Buffer = Encrypt.Encryptiondata(lbl_InvoiceNo.Text.ToString());
//TempInvoiceId = Convert.ToBase64String(Buffer);
#region Create Encrypted Path
byte[] EncCode = Encrypt.Encryptiondata(lbl_INo.Text);
hidEncrypteCode.Value = Convert.ToBase64String(EncECode);
#endregion
//#region Create Email Body !!
//body = hid_EmailBody.Value.Replace("@greeting", lbl_CoName.Text).Replace("@free", hid_ToNo.Value).Replace("@llnk", "<a style='font-family: Tahoma; font-size: 10pt; color: #800000; font-weight: bold' href='http://1ccccc/ccc/ccc/ccc.aspx?EC=" + hidEncryptedCode.Value+ "' > C cccccccc </a>");
body = hid_EmailBody.Value.Replace("@greeting", "Hii").Replace("@No", hid_No.Value);/*For Mail*/
//#endregion
#region For Email Sender Informations..!!
for (int j = 0; j < CountEmail; j++)
//if (File.Exists(fofile + "\\" + CreateFileName))
//
#region
lbl_EmailId.Text = orimail[j];
retmailflg = "";
/**Region For Send Email For Clients**/
//retmailflg = SendPreMail("Wp From " + lbl_CName.Text + "", body, lbl_EmailId.Text, lbl_IeNo.Text, hid_EmailIdName.Value, hid_EmailPassword.Value);
retmailflg = SendPreMail(hid_EmailSubject.Value, Body, lbl_EmailId.Text, lbl_No.Text, hid_EmailIdName.Value, hid_EmailPassword.Value);
/**End Region**/
/**Region For Create Send Email Log When Email Send Successfully**/
if (retmailflg == "True")
SendCurrentMail = Convert.ToInt32(SendCurrentMail) + 1;
StartLmt = Convert.ToInt32(StartLmt) + 1;
if (SendCurrentMail > 0)
CreateEmailLog(lbl_InNo.Text, StartLmt, hid_EmailIdName.Value, lbl_EmailId.Text);
/**End Region**/
#endregion
//
#endregion
#endregion
/**End Region**/
#endregion
private void CreateEmailLog(string UniqueId, int StartLmt, string FromEmailId, string TotxtEmailId)
FPL.EmailId_From = FromEmailId;
FPL.To_EmailId = TotxtEmailId;
FPL.SendDate = DateTime.Now.ToString("dd-MMM-yyyy");
FPL.EmailUniqueId = UniqueId;
FPL.SendNo_Of_Email = StartLmt.ToString();
FPL.LoginUserId = Session["LoginUserId"].ToString();
int i = FBL.InsertEmaDoc(FPL);
public string SendPreMail(string emsub, string embody, string EmailId, string FileId, string EmailFromId, string Password)
string retval = "False";
try
string emailBody, emailSubject, emailToList, emailFrom,
accountPassword, smtpServer;
bool enableSSL;
int port;
emailBody = embody;
emailSubject = emsub;
emailToList = EmailId;
emailFrom = EmailFromId;
accountPassword = Password;
smtpServer = "smtp.gmail.com";
enableSSL = true;
port = 587;
string crefilename;
string fofile;
fofile = Server.MapPath("PDF");
crefilename = FileId + ".Pdf";
string[] att = crefilename ;
string retemail, insertqry;
retemail = "";
retemail = SendEmail(emailBody, emailSubject, emailFrom, emailToList, att, smtpServer, enableSSL, accountPassword, port);
if (retemail == "True")
retval = retemail;
catch
retval = "False";
finally
return retval;
public string SendEmail(string emailBody, string emailSubject, string emailFrom, string emailToList, string[] attachedFiles, string smtpIPAddress, bool enableSSL, string accountPassword, int port)
MailMessage mail = new MailMessage();
string retflg;
retflg = "False";
try
mail.From = new MailAddress(emailFrom);
if (emailToList.Contains(";"))
emailToList = emailToList.Replace(";", ",");
mail.To.Add(emailToList);
mail.Subject = emailSubject;
mail.IsBodyHtml = true;
mail.Body = emailBody;
SmtpClient smtp = new SmtpClient();
smtp.Host = "smtp.gmail.com";
smtp.EnableSsl = true;
NetworkCredential NetworkCred = new NetworkCredential(emailFrom, accountPassword);
smtp.UseDefaultCredentials = true;
smtp.Credentials = NetworkCred;
smtp.Port = 587;
smtp.Send(mail);
retflg = "True";
catch
retflg = "False";
finally
mail.Dispose();
return retflg;
【讨论】：
【参考方案9】：如果您想在 razor 中生成电子邮件正文，可以使用Mailzory。另外，你可以从here下载nuget包。
// template path
var viewPath = Path.Combine("Views/Emails", "hello.cshtml");
// read the content of template and pass it to the Email constructor
var template = File.ReadAllText(viewPath);
var email = new Email(template);
// set ViewBag properties
email.ViewBag.Name = "Johnny";
email.ViewBag.Content = "Mailzory Is Funny";
// send email
var task = email.SendAsync("mailzory@outlook.com", "subject");
task.Wait()
【讨论】：
【参考方案10】：据此：
SmtpClient 及其网络类型设计不佳，我们强烈 建议您使用https://github.com/jstedfast/MailKit 和 https://github.com/jstedfast/MimeKit 代替。
参考：https://docs.microsoft.com/en-us/dotnet/api/system.net.mail.smtpclient?view=netframework-4.8
最好用MailKit发邮件：
var message = new MimeMessage ();
message.From.Add (new MailboxAddress ("Joey Tribbiani", "joey@friends.com"));
message.To.Add (new MailboxAddress ("Mrs. Chanandler Bong", "chandler@friends.com"));
message.Subject = "How you doin'?";
message.Body = new TextPart ("plain")
Text = @"Hey Chandler,
I just wanted to let you know that Monica and I were going to go play some paintball, you in?
-- Joey"
;
using (var client = new SmtpClient ())
// For demo-purposes, accept all SSL certificates (in case the server supports STARTTLS)
client.ServerCertificateValidationCallback = (s,c,h,e) => true;
client.Connect ("smtp.friends.com", 587, false);
// Note: only needed if the SMTP server requires authentication
client.Authenticate ("joey", "password");
client.Send (message);
client.Disconnect (true);
【讨论】：
【参考方案11】：Google 可能会阻止来自不使用现代安全标准的某些应用或设备的登录尝试。由于这些应用和设备更容易被入侵，因此阻止它们有助于确保您的帐户更安全。
一些不支持最新安全标准的应用示例包括：
-
安装 ios 6 或更低版本的 iPhone 或 iPad 上的邮件应用
Windows 手机上 8.1 版本之前的邮件应用
某些桌面邮件客户端，例如 Microsoft Outlook 和 Mozilla Thunderbird
因此，您必须在您的 Google 帐户中启用不太安全的登录（或不太安全的应用访问权限）。
登录谷歌账号后，前往：
https://www.google.com/settings/security/lesssecureapps 要么 https://myaccount.google.com/lesssecureapps
在 C# 中，您可以使用以下代码：
MimeMessage message = new MimeMessage();
BodyBuilder Attachmint = new BodyBuilder();
message.From.Add(new MailboxAddress("name sender", "Mail From"));
message.To.Add(MailboxAddress.Parse("Mail To"));
message.Subject = Subject;
message.Body = new TextPart("plain")
Text = tex_body.Text + Massage
;
Attachmint.Attachments.Add("Attatchment Path");
message.Body = Attachmint.ToMessageBody();
SmtpClient client = new SmtpClient();
client.Connect("smtp.gmail.com", 465, true);
client.Authenticate("Mail from", "Password mail");
client.Send(message);
您可以将邮件从 Gmail 发送到作为 X@PrivetCompany.com 的私人邮箱
【讨论】：
【参考方案12】：MailMessage mm = new MailMessage(txtEmail.Text, txtTo.Text);
mm.Subject = txtSubject.Text;
mm.Body = txtBody.Text;
if (fuAttachment.HasFile)//file upload select or not
string FileName = Path.GetFileName(fuAttachment.PostedFile.FileName);
mm.Attachments.Add(new Attachment(fuAttachment.PostedFile.InputStream, FileName));
mm.IsBodyHtml = false;
SmtpClient smtp = new SmtpClient();
smtp.Host = "smtp.gmail.com";
smtp.EnableSsl = true;
NetworkCredential NetworkCred = new NetworkCredential(txtEmail.Text, txtPassword.Text);
smtp.UseDefaultCredentials = true;
smtp.Credentials = NetworkCred;
smtp.Port = 587;
smtp.Send(mm);
Response.write("Send Mail");
观看视频：https://www.youtube.com/watch?v=bUUNv-19QAI
【讨论】：
【参考方案13】：这是最容易测试的脚本。
<%@ Import Namespace="System.Net" %>
<%@ Import Namespace="System.Net.Mail" %>
<script language="C#" runat="server">
protected void Page_Load(object sender, EventArgs e)
//create the mail message
MailMessage mail = new MailMessage();
//set the addresses
mail.From = new MailAddress("From email account");
mail.To.Add("To email account");
//set the content
mail.Subject = "This is a test email from C# script";
mail.Body = "This is a test email from C# script";
//send the message
SmtpClient smtp = new SmtpClient("mail.domainname.com");
NetworkCredential Credentials = new NetworkCredential("to email account", "Password");
smtp.Credentials = Credentials;
smtp.Send(mail);
lblMessage.Text = "Mail Sent";
</script>
<html>
<body>
<form runat="server">
<asp:Label id="lblMessage" runat="server"></asp:Label>
</form>
</body>
【讨论】：
为什么会选择把它放在视图中而不让控制器处理呢？ 刚刚问了关于通过 ASP.NET C# 发送电子邮件的问题。没有提到在脚本中设置控制器。以上是关于如何在 ASP.NET C# 中发送电子邮件的主要内容，如果未能解决你的问题，请参考以下文章
在asp.net mvc 3中的后台作业/计划任务中发送电子邮件