Actually Daniel, I'm glad you mentioned it. HaskellNet and HaskellNet-SSL actually worked for me! Thank you for that!

The only thing I noticed with Gmail is that in order to work it requires the sender's account to toggle this setting:
Allow less secure apps: OFF

Doesn't seem ideal, but I'm not sure if that's a fault of the library itself or just the way it is with generic 3rd party apps that aren't somehow registered with Google. But in any case, when I try it with another Amazon AWS account, it doesn't have that problem, so it's all good since that's the real account I wanted to get it working with anyway (Gmail was just a more convenient "testing" platform).

In any case, here is the short generic code that works for future reference so that hopefully others don't have to go through the same process just to send an email. Thanks again Daniel, and thanks to everyone else for their answers as well!

P.S. the sslLogToConsole option is great for seeing the handshaking going on with the SMTP server.

main :: IO ()
main = doSMTPSTARTTLSWithSettings "smtp.gmail.com" settings $ \conn -> do
  authSucceed <- authenticate LOGIN "gmail_login" "gmail_password" conn
  if authSucceed
    then do
      putStrLn "Sending email..."
      sendPlainTextMail "recipient@somewhere.com"
                                    "sender@somewhere_else.com"
                                    "Haskell Email"
                                    "I can finally send email from Haskell now!!"
                                    conn
    else print "Authentication failed."
  where settings = defaultSettingsSMTPSTARTTLS { sslPort = 587, sslLogToConsole = True }


On Mon, Apr 18, 2016 at 10:59 PM, Daniel P. Wright <dani@dpwright.com> wrote:
Not to throw another spanner in the works with Yet Another Package to try, but another option is HaskellNet[1] with HaskellNet-SSL[2] for your TLS connection.  I originally wrote the HaskellNet-SSL wrapper but it's currently being maintained by Leza Morais Lutonda.  It works with gmail.  I haven't tried any of the other SMTP options and I mostly used it for IMAP, not SMTP, so I can't compare them directly or recommend one over the other -- just throwing it out there as another option!

[1]: http://hackage.haskell.org/package/HaskellNet
[2]: http://hackage.haskell.org/package/HaskellNet-SSL

2016-04-19 6:42 GMT+09:00 David Escobar <davidescobar1976@gmail.com>:
Hi everyone,
I'm trying to use the Network.Mail.SMTP library to send email:

{-# LANGUAGE OverloadedStrings #-}

module Main where

import Control.Exception

import qualified Data.Text as T
import qualified Data.Text.Lazy as LT
import Network.Mail.SMTP

main :: IO ()
main = do
  sendEmail (“Person sender”, “sender@somewhere.com”)
            [(“Person recipient“, “recipient@somewhere.com”)]
            "Test email"
            "Some message goes here."


sendEmail :: (T.Text, T.Text) -> [(T.Text, T.Text)] -> T.Text -> T.Text -> IO ()
sendEmail (fromName, fromEmail) toAddresses subject' body' = do
  let toNameAddrs = map (\(toName, toEmail) -> Address (Just toName) toEmail) toAddresses
      msg = simpleMail (Address (Just fromName) fromEmail)
                       toNameAddrs
                       []
                       []
                       subject'
                       [ plainTextPart $ LT.fromStrict body' ]
  result <- try $ sendMailWithLogin' "smtp.gmail.com"
                                     465 -- SSL port
                                     “sender_login”
                                     “sender_password”
                                     msg :: IO (Either SomeException ())
  case result of
    Left e -> putStrLn $ "Exception caught: " ++ (displayException e)
    Right _ -> putStrLn "Sent email successfully."


The program compiles, but when I run it, I get:

Exception caught: <socket: 49>: Data.ByteString.hGetLine: end of file

I tried using the TLS port of 587, but then I just get an authentication failure. Am I using the wrong library or is it just the wrong configuration. Thanks.


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