SmtpClient.Connect Method

Connects a SMTP server.

[Visual Basic]
Public Sub Connect( _
    server As SmtpServer _
)

[C#]
public void Connect(
    SmtpServer server
);

[C++]
public: void Connect(
    SmtpServer^ server
);

[JScript]
public function Connect(
    server : SmtpServer
);

Parameters

server
A SmtpServer instances to connect.

Remarks

The combination of Connect, Quit, Reset methods and SmtpClient.SendMail( SmtpMail mail ) methods sends multiple emails in one SMTP connection session. DO NOT use Connect, Quit and Reset methods with SmtpClient.SendMail( SmtpServer server, SmtpMail mail ) method. SmtpClient.SendMail( SmtpServer server, SmtpMail mail ) method connects and disconnects smtp server automatically.

Example

[Visual Basic, C#, C++] To get the full samples of EASendMail, please refer to Samples section. 

[VB - Send multiple emails in one SMTP connection session]

Imports EASendMail

Sub SendTwoMailsInOneConnection()

    Try
        Dim oServer As SmtpServer = New SmtpServer("myserveraddress")
        ' SMTP user authentication
        oServer.User = "myusername"
        oServer.Password = "mypassword"

        ' Most mordern SMTP servers require SSL/TLS connection now.
        ' ConnectTryTLS means if server supports SSL/TLS, SSL/TLS will be used automatically.
        oServer.ConnectType = SmtpConnectType.ConnectTryTLS

        Dim oSmtp As SmtpClient = New SmtpClient
        oSmtp.Connect(oServer)

        Dim oMail As SmtpMail = New SmtpMail("TryIt")
        oMail.From = New MailAddress("from@adminsystem.com")
        oMail.To.Add(New MailAddress("to@adminsystem.com"))

        oMail.Subject = "firset test email"
        oMail.TextBody = "test body"

        oSmtp.SendMail(oMail)
        Console.WriteLine("first sent")

        oSmtp.Reset()
        oMail.Reset()

        oMail.From = New MailAddress("from@adminsystem.com")
        oMail.To.Add(New MailAddress("another@adminsystem.com"))

        oMail.Subject = "second test email"
        oMail.TextBody = "another body"

        oSmtp.SendMail(oMail)
        Console.WriteLine("second sent")
        oSmtp.Quit()

    Catch exp As Exception
        Console.WriteLine("Exception: {0}", exp.Message)
    End Try

End Sub

Sub SendMail()

    Try
        Dim oServer As SmtpServer = New SmtpServer("myserveraddress")
        ' SMTP user authentication
        oServer.User = "myusername"
        oServer.Password = "mypassword"

        ' Most mordern SMTP servers require SSL/TLS connection now.
        ' ConnectTryTLS means if server supports SSL/TLS, SSL/TLS will be used automatically.
        oServer.ConnectType = SmtpConnectType.ConnectTryTLS

        Dim oMail As SmtpMail = New SmtpMail("TryIt")
        oMail.From = New MailAddress("from@adminsystem.com")
        oMail.To.Add(New MailAddress("to@adminsystem.com"))

        oMail.Subject = "test subject"
        oMail.TextBody = "test body"

        Dim oSmtp As SmtpClient = New SmtpClient()
        oSmtp.SendMail(oServer, oMail)
        Console.WriteLine("message was sent")
    Catch exp As Exception
        Console.WriteLine("Exception: {0}", exp.Message)
    End Try

End Sub



[C# - Send multiple emails in one SMTP connection session]

using System;
using EASendMail;

void SendTwoMailsInOneConnection()
{
    try
    {
        SmtpServer oServer = new SmtpServer("myserveraddress");
        // SMTP user authentication
        oServer.User = "myusername";
        oServer.Password = "mypassword";

        // Most mordern SMTP servers require SSL/TLS connection now.
        // ConnectTryTLS means if server supports SSL/TLS, SSL/TLS will be used automatically.
        oServer.ConnectType = SmtpConnectType.ConnectTryTLS;

        SmtpClient oSmtp = new SmtpClient();
        oSmtp.Connect(oServer);

        SmtpMail oMail = new SmtpMail("TryIt");
        oMail.From = new MailAddress("from@adminsystem.com");
        oMail.To.Add(new MailAddress("to@adminsystem.com"));

        oMail.Subject = "first test email";
        oMail.TextBody = "test body";

        oSmtp.SendMail(oMail);
        Console.WriteLine("first sent");

        oSmtp.Reset();
        oMail.Reset();

        oMail.From = new MailAddress("from@adminsystem.com");
        oMail.To.Add(new MailAddress("another@adminsystem.com"));

        oMail.Subject = "second test email";
        oMail.TextBody = "another body";

        oSmtp.SendMail(oMail);
        Console.WriteLine("second sent");
        oSmtp.Quit();
    }
    catch (Exception exp)
    {
        Console.WriteLine("Exception: {0}", exp.Message);
    }
}

void SendMail()
{
    try
    {
        SmtpServer oServer = new SmtpServer("myserveraddress");
        // SMTP user authentication
        oServer.User = "myusername";
        oServer.Password = "mypassword";

        // Most mordern SMTP servers require SSL/TLS connection now.
        // ConnectTryTLS means if server supports SSL/TLS, SSL/TLS will be used automatically.
        oServer.ConnectType = SmtpConnectType.ConnectTryTLS;

        SmtpMail oMail = new SmtpMail("TryIt");
        oMail.From = new MailAddress("from@adminsystem.com");
        oMail.To.Add(new MailAddress("to@adminsystem.com"));

        oMail.Subject = "test subject";
        oMail.TextBody = "test body";

        SmtpClient oSmtp = new SmtpClient();
        oSmtp.SendMail(oServer, oMail);
        Console.WriteLine("message was sent");
    }
    catch (Exception exp)
    {
        Console.WriteLine("Exception: {0}", exp.Message);
    }
}
        


[C++/CLI - Send multiple emails in one SMTP connection session]

using namespace System;
using namespace EASendMail;

void SendTwoMailsInOneConnection()
{
    try
    {
        SmtpServer ^oServer = gcnew SmtpServer("myserveraddres");
        // SMTP user authentication
        oServer->User = "myusername";
        oServer->Password = "mypassword";

        // Most mordern SMTP servers require SSL/TLS connection now.
        // ConnectTryTLS means if server supports SSL/TLS, SSL/TLS will be used automatically.
        oServer->ConnectType = SmtpConnectType::ConnectTryTLS;

        SmtpClient ^oSmtp = gcnew SmtpClient();
        oSmtp->Connect(oServer);

        SmtpMail ^oMail = gcnew SmtpMail("TryIt");
        oMail->From = gcnew MailAddress("from@adminsystem.com");
        oMail->To->Add(gcnew MailAddress("to@adminsystem.com"));

        oMail->Subject = "first test email";
        oMail->TextBody = "test body";

        oSmtp->SendMail(oMail);
        Console::WriteLine("first sent");

        oSmtp->Reset();
        oMail->Reset();

        oMail->From = gcnew MailAddress("from@adminsystem.com");
        oMail->To->Add(gcnew MailAddress("another@adminsystem.com"));
        
        oMail->Subject = "second test email";
        oMail->TextBody = "another body";

        oSmtp->SendMail(oMail);
        Console::WriteLine("second sent");
        oSmtp->Quit();
    }
    catch (Exception ^exp)
    {
        Console::WriteLine("Exception: {0}", exp->Message);
    }
}

void SendMail()
{
    try
    {
        SmtpServer ^oServer = gcnew SmtpServer("myserveraddres");
        // SMTP user authentication
        oServer->User = "myusername";
        oServer->Password = "mypassword";

        // Most mordern SMTP servers require SSL/TLS connection now.
        // ConnectTryTLS means if server supports SSL/TLS, SSL/TLS will be used automatically.
        oServer->ConnectType = SmtpConnectType::ConnectTryTLS;

        SmtpMail ^oMail = gcnew SmtpMail("TryIt");
        oMail->From = gcnew MailAddress("from@adminsystem.com");
        oMail->To->Add(gcnew MailAddress("to@adminsystem.com"));

        oMail->Subject = "test subject";
        oMail->TextBody = "test body";

        SmtpClient ^oSmtp = gcnew SmtpClient();
        oSmtp->SendMail(oServer, oMail);
        Console::WriteLine("message was sent");
    }
    catch (Exception ^exp)
    {
        Console::WriteLine("Exception: {0}", exp->Message);
    }
}

See Also

SmtpClient.SendMail Method
SmtpClient.Quit Method
SmtpClient.Reset Method