Rebex Secure Mail

SMTP, IMAP, EWS, POP3, S/MIME .NET library

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Easy-to-use API

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Sending email using SMTP 

A typical SMTP session goes through the following steps:

The following code sends a simple mail message: 

string sender = "my_account@gmail.com";
string recipient = "to@example.org";
string subject = "Test";
string body = "Hello World!";

// create SMTP client instance
using (var smtp = new Rebex.Net.Smtp())
{
    // connect to Gmail SMTP server
    smtp.Connect("smtp.gmail.com", SslMode.Explicit);

    // authenticate with your email address and password
    smtp.Login(sender, password);

    // send mail
    smtp.Send(sender, recipient, subject, body);

    // disconnect (not required, but polite)
    smtp.Disconnect();
}

Dim sender As String = "my_account@gmail.com"
Dim recipient As String = "to@example.org"
Dim subject As String = "Test"
Dim body As String = "Hello World!"

' create SMTP client instance
Using smtp = New Rebex.Net.Smtp()
    ' connect to Gmail SMTP server
    smtp.Connect("smtp.gmail.com", SslMode.Explicit)

    ' authenticate with your email address and password
    smtp.Login(sender, password)

    ' send mail
    smtp.Send(sender, recipient, subject, body)

    ' disconnect (not required, but polite)
    smtp.Disconnect()
End Using

Sending e-mail can be even easier. Check out Sending e-mail with a single line of code.

Getting list of unread emails using IMAP 

A typical IMAP session goes through the following steps:

The following code finds all unread e-mail messages and prints information about each of them: 

// create IMAP client instance
using (var imap = new Rebex.Net.Imap())
{
    // connect to Gmail IMAP server
    imap.Connect("imap.gmail.com", SslMode.Implicit);

    // authenticate
    imap.Login(username, password);

    // select folder to work with
    imap.SelectFolder("INBOX");

    // get list of unread messages
    ImapMessageCollection list = imap.Search(ImapSearchParameter.Unread);

    // print some info
    foreach (ImapMessageInfo info in list)
    {
        Console.WriteLine("From: {0}", info.From);
        Console.WriteLine("To: {0}", info.To);
        Console.WriteLine("Subject: {0}", info.Subject);
    }

    // disconnect (not required, but polite)
    imap.Disconnect();
}

' create IMAP client instance
Using imap = New Rebex.Net.Imap()
    ' connect to Gmail IMAP server
    imap.Connect("imap.gmail.com", SslMode.Implicit)

    ' authenticate
    imap.Login(username, password)

    ' select folder to work with
    imap.SelectFolder("INBOX")

    ' get list of unread messages
    Dim list As ImapMessageCollection = imap.Search(ImapSearchParameter.Unread)

    ' print some info
    For Each info As ImapMessageInfo In list
        Console.WriteLine("From: {0}", info.From)
        Console.WriteLine("To: {0}", info.To)
        Console.WriteLine("Subject: {0}", info.Subject)
    Next

    ' disconnect (not required, but polite)
    imap.Disconnect()
End Using

Note: Although implicit SSL mode has been discouraged since 1999 (see RFC 2595) Gmail and some other providers still only supports this mode. Explicit mode should be used instead when available.

Getting list of unread emails using Exchange Web Services (EWS) 

A typical EWS (Exchange Web Services) session goes through the following steps:

Note: EWS protocol is only supported by Microsoft Exchange and Office 365.

The following code finds all unread e-mail messages and prints information about each of them: 

// create EWS client instance
using (var client = new Rebex.Net.Ews())
{
    // connect to Exchange server
    client.Connect(hostname, SslMode.Implicit);

    // authenticate
    client.Login(username, password);

    // to select folder to work with use either:
    // - client.FindFolder(EwsFolderId.Root, "folderName")
    // - predefined folder id
    var folder = EwsFolderId.Inbox;

    // get list of unread messages
    var list = client.Search(
        folder,
        EwsSearchParameter.IsRead(false));

    // print some info
    foreach (var messageInfo in list)
    {
        Console.WriteLine("From: {0}", messageInfo.From);
        Console.WriteLine("To: {0}", messageInfo.To);
        Console.WriteLine("Subject: {0}", messageInfo.Subject);
    }

    // disconnect (not required, but polite)
    client.Disconnect();
}

' create IMAP client instance
Using client = New Rebex.Net.Ews()
    ' connect to Exchange   server
    client.Connect(hostname, SslMode.Implicit)

    ' authenticate
    client.Login(username, password)

    ' to select folder to work with use either
    '  - client.FindFolder(EwsFolderId.Root, "folderName")
    '  - predefined folder id
    Dim folder = EwsFolderId.Inbox

    ' get list of unread messages
    Dim list As EwsMessageCollection = client.Search(
        folder,
        EwsSearchParameter.IsRead(False))

    ' print some info
    For Each messageInfo As EwsMessageInfo In list
        Console.WriteLine("From: {0}", messageInfo.From)
        Console.WriteLine("To: {0}", messageInfo.To)
        Console.WriteLine("Subject: {0}", messageInfo.Subject)
    Next

    ' disconnect (not required, but polite)
    client.Disconnect()
End Using

Downloading emails using POP3 

A typical POP3 session goes through the following steps:

The following code downloads all emails: 

// create POP3 client instance
using (var pop3 = new Rebex.Net.Pop3())
{
    // connect to Gmail POP3 server
    pop3.Connect("pop.gmail.com", SslMode.Implicit);

    // authenticate
    pop3.Login(username, password);

    // get message list
    Pop3MessageCollection list = pop3.GetMessageList();

    // print some info
    Console.WriteLine("{0} email(s) found.", list.Count);

    // download all messages
    foreach (Pop3MessageInfo info in list)
    {
        MailMessage mail = pop3.GetMailMessage(info.SequenceNumber);

        // do something with the mail
        // ...
    }

    // disconnect (required to commit delete operations)
    pop3.Disconnect();
}

' create POP3 client instance
Using pop3 = New Rebex.Net.Pop3()
    ' connect to Gmail POP3 server
    pop3.Connect("pop.gmail.com", SslMode.Implicit)

    ' authenticate
    pop3.Login(username, password)

    ' get message list
    Dim list As Pop3MessageCollection = pop3.GetMessageList()

    ' print some info
    Console.WriteLine("{0} email(s) found.", list.Count)

    ' download all messages
    For Each info As Pop3MessageInfo In list

        ' do something with the mail
        ' ...
        Dim mail As MailMessage = pop3.GetMailMessage(info.SequenceNumber)
    Next

    ' disconnect (required to commit delete operations)
    pop3.Disconnect()
End Using

Note: Although implicit SSL mode has been discouraged since 1999 (see RFC 2595) Gmail and some other providers still only supports this mode. Explicit mode should be used instead when available.

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