This module provides functions for working with the SMTP protocol in the client side, including opening and closing connections, sending commands to the server, authenticate and sending mails.

Here's a basic usage example:

import Network.HaskellNet.SMTP
import Network.HaskellNet.Auth
import qualified Data.Text.Lazy as T

main = doSMTP "your.smtp.server.com" $ \conn ->
   authSucceed <- authenticate PLAIN "username" "password" conn
   if authSucceed
       then sendPlainTextMail "receiver@server.com" "sender@server.com" "subject" (T.pack "Hello! This is the mail body!") conn
       else print "Authentication failed."

Notes for the above example:

• First the SMTPConnection is opened with the doSMTP function. The connection should also be established with functions such as connectSMTP, connectSMTPPort and doSMTPPort. With the doSMTP* functions the connection is opened, then executed an action with it and then closed automatically. If the connection is opened with the connectSMTP* functions you may want to close it with the closeSMTP function after using it. It is also possible to create a SMTPConnection from an already opened connection stream (BSStream) using the connectStream or doSMTPStream functions.

NOTE: For SSL/TLS support you may establish the connection using the functions (such as connectSMTPSSL) provided in the Network.HaskellNet.SMTP.SSL module of the HaskellNet-SSL package.

• The authenticate function authenticates to the server with the specified AuthType. PLAIN, LOGIN and CRAM_MD5 AuthTypes are available. It returns a Bool indicating either the authentication succeed or not.
• To send a mail you can use sendPlainTextMail for plain text mail, or sendMimeMail for mime mail.