如何使用 .NET Framework 設定 SSL SMTP 電子郵件傳送？

使用.NET Framework 進行SSL SMTP

使用.NET Framework 透過電子郵件可以透過設定SMTP 用戶端來實現因此。這是分步指南：

1.創建SmtpClient 實例：

System.Net.Mail.SmtpClient _SmtpServer = new System.Net.Mail.SmtpClient();

2.指定服務器主機和端口：

_SmtpServer.Host = "smtp.yourserver.com";
_SmtpServer.Port = 465;

3.啟用SSL：

_SmtpServer.EnableSsl = true;

4.設定憑證（選用）：

_SmtpServer.Credentials = new System.Net.NetworkCredential("username", "password");

5.設定傳送逾時：

_SmtpServer.Timeout = 5000;

6.將UseDefaultCredentials 設定為False：

_SmtpServer.UseDefaultCredentials = false;

郵件消息：

MailMessage mail = new MailMessage();
mail.From = new MailAddress(from);
mail.To.Add(to);
mail.Subject = subject;
mail.Body = content;
mail.IsBodyHtml = useHtml;

8.發送電子郵件：

_SmtpServer.Send(mail);

Gmail 的SMTP 服務器示例：

using System.Web.Mail;
using System;

public class MailSender
{
    public static bool SendEmail(string pGmailEmail, string pGmailPassword, string pTo, string pSubject, string pBody, MailFormat pFormat)
    {
        try
        {
            MailMessage myMail = new MailMessage();
            myMail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpserver", "smtp.gmail.com");
            myMail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpserverport", "465");
            myMail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusing", "2");

            myMail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1");
            myMail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", pGmailEmail);
            myMail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", pGmailPassword);
            myMail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpusessl", "true");

            myMail.From = pGmailEmail;
            myMail.To = pTo;
            myMail.Subject = pSubject;
            myMail.BodyFormat = pFormat;
            myMail.Body = pBody;

            SmtpMail.SmtpServer = "smtp.gmail.com:465";
            SmtpMail.Send(myMail);

            return true;
        }
        catch (Exception ex)
        {
            throw;
        }
    }
}

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