edit: It appears that many people are having this problem.
I am using the Pony email gem to send SMS' to phone numbers in a Ruby on Rails app. It is hosted on Heroku. When sent from Pony, it works on AT&T and Verizon, but not on T-Mobile. But, when I send the email from the Gmail web interface the SMS is delivered to the T-Mobile number.
I'm thinking some of the email headers are causing T-Mobile to reject the email. Here is the email sent from Gmail (private information obscured):
MIME-Version: 1.0
Received: by 55.55.55.55 with HTTP; Mon, 2 Mar 2015 23:51:51 -0800 (PST)
Date: Mon, 2 Mar 2015 23:51:51 -0800
Delivered-To: valid.from.email@gmail.com
Message-ID: <CAN-5ELre3XqXgZQ-6_QGz7C=YXpAoZuTXPODHSmnZ=EOXA0Xwg@mail.gmail.com>
Subject:
From: From Name <valid.from.email@gmail.com>
To: valid.10.digit.phone.number@tmomail.net
Content-Type: text/plain; charset=UTF-8
email content
This is the email sent from Pony. I know this email is being sent because it shows up under Sent in the Gmail web interface.
Return-Path: <valid.from.email@gmail.com>
Received: from localhost.localdomain (ec2-55-555-55-555.compute-1.amazonaws.com. [55.555.55.555])
by mx.google.com with ESMTPSA id g29sm577452ioi.35.2015.03.02.23.50.57
for <valid.10.digit.phone.number@tmomail.net>
(version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
Mon, 02 Mar 2015 23:50:57 -0800 (PST)
Date: Tue, 03 Mar 2015 07:50:56 +0000
From: Frome Name <valid.from.email@gmail.com>
To: valid.10.digit.phone.number@tmomail.net
Message-ID: <54f567e08593f_33ff884d99e98497cf@d599820b-b537-4e60-bc52-671c771bf43c.mail>
Mime-Version: 1.0
Content-Type: text/plain;
charset=UTF-8
Content-Transfer-Encoding: 7bit
Delivered-To: valid.from.email@gmail.com
Pony Message content
This is the code that I'm using to send the email.
Pony.mail({
:to => 'valid.10.digit.phone.number@tmomail.net',
:body => 'Test Pony',
:headers => { "Delivered-To" => "valid.from.email@gmail.com", 'Content-Type' => 'text/html' },
:subject => 'Subject',
:from => 'From Name <valid.from.email@gmail.com>',
:via => :smtp,
:via_options => {
:address => 'smtp.gmail.com',
:port => '587',
:enable_starttls_auto => true,
:user_name => 'valid.from.email@gmail.com',
:password => ENV['EMAIL_PASSWORD'],
:authentication => :plain, # :plain, :login, :cram_md5, no auth by default
}
})
The headers that I suspect could be causing the problems are the Received, Content-Type (there is a line break on the Pony email), and Content-Transfer-Encoding headers. I couldn't figure out how to change any of those values in Pony.
