How To Send Email Using CritSend's SMTP Relay

Basic SMTP Setup

Server	smtp.critsend.com
Port	25 or 587
Username	[your CritSend username]
Password	[your CritSend password]
Encryption	Plain Text

Configuring Sendmail for CritSend's SMTP Relay

/etc/mail/access should include:

AuthInfo:smtp.critsend.com "U:CritSendUsername" "P:CritSendPassword" "M:PLAIN"

yum install sendmail-cf

cd /etc/mail

echo "AuthInfo:smtp.critsend.com \"U:YourCritSendUsername\" \"P:YourCritSendPassword\" \"M:PLAIN\"" > access

makemap hash access.db < access

add the following to /etc/mail/sendmail.mc

define(`SMART_HOST', `smtp.critsend.com')dnl
dnl #FEATURE(`access_db', `hash -T -o /etc/mail/access.db < /etc/mail/access')dnl
FEATURE(`authinfo', `hash /etc/mail/access.db')dnl
define(`RELAY_MAILER_ARGS', `TCP $h 587')dnl
define(`ESMTP_MAILER_ARGS', `TCP $h 587')dnl
define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl

/etc/init.d/sendmail restart

Configuring Postfix for CritSend's SMTP Relay

To use CritSend's SMTP relay, your main.cf should include:

smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = static:YourCritSendUsername:YourCritSendPassword
smtp_sasl_security_options = noanonymous
header_size_limit = 4096000
relayhost = [smtp.critsend.com]:25

You may need to install libsasl2-modules

Configuring Exim for CritSend's SMTP Relay

Update /etc/exim4/update-exim4.conf.conf file:

dc_eximconfig_configtype='smarthost'
dc_other_hostnames=''
dc_local_interfaces='127.0.0.1'
dc_readhost='your.server.name'
dc_relay_domains=''
dc_minimaldns='false'
dc_relay_nets=''
dc_smarthost='smtp.critsend.com::587'
CFILEMODE='644'
dc_use_split_config='false'
dc_hide_mailname='true'
dc_mailname_in_oh='true'

Set your password and username to be your CritSend username and password:

*:YourCritSendUsername: YourCritSendPassword

For the/etc/exim4/exim4.conf.localmacros (create file if it doesn't already exist):

MAIN_TLS_ENABLE= 1

Make sure you Restart your Exim server afterwards.

How to Send Email in PHP through the CritSend SMTP Relay

Here is the sample PHP code to send SMTP emails. The PHP PEAR mail package must be installed for this to work.

 $from, "To" => $to, "Subject" => $subject);
$smtp = Mail::factory("smtp",
array(  "host" => $host,
       "auth" => true,
       "username" => $username,
       "password" => $password));

$mail = $smtp->send($to, $headers, $body);

if(PEAR::isError($mail)){
    echo($mail->getMessage());
}else{
    echo("Message successfully sent!");
}
?>

Sending mail in Ruby on Rails with CritSend's SMTP Relay

Create a file config/initializers/critsend.rb

ActionMailer::Base.smtp_settings = {
       :address => "smtp.critsend.com",
       :port => 587,
       :authentication => :plain,
       :user_name => "YOUR_CRITSEND_USERNAME",
       :password => "YOUR_CRITSEND_PASSWORD",
       :enable_starttls_auto => false
}

ActionMailer::Base.delivery_method = :smtp

Sending mail in .NET with CritSend's SMTP Relay

Using ASP.net you can sent SMTP emails using CritSend.

MailMessage message = new MailMessage();
message.From = new MailAddress("your_email@example.com");

message.To.Add(new MailAddress("recipient1@example.com"));
message.To.Add(new MailAddress("recipient2@example.com"));
message.To.Add(new MailAddress("recipient3@example.com"));

message.Subject = "Subject goes here";
message.Body = "The message goes here";

SmtpClient client = new SmtpClient();
client.Send(message);

System.Net.Mail reads SMTP configuration data out of the web.config file. Here is a way to configure it:


<system.net>
<mailSettings>
  <smtp from="your_email@example.com">
    <network host="smtp.critsend.com" port="587" userName="YourCritSendUsername"
    password="YourCritSendPassword" defaultCredentials="true" />
  </smtp>
</mailSettings>
</system.net>

Configuring Python for CritSend's SMTP Relay

This simple python script can be used to send emails via the SMTP relay. The script can be modified to send email addresses to multiple people.

import smtplib

#your critsend's credentials
critsend_user = 'YOUR CRITSEND USERNAME'
critsend_password = 'YOUR CRITSEND PASSWORD'

sender = "YOUR NAME "
recipients = ['RECIPIENT EMAIL']
subject = "My subject"
content = """My email message"""

message = ("From: %s\r\nTo: %s\r\nSubject: %s\r\n%s" % (sender, ", ".join(recipients), subject, content))

try:
    server = smtplib.SMTP("smtp.critsend.com", 587)
    server.ehlo()
    server.starttls()
    server.ehlo
    server.login(critsend_user, critsend_password)
    server.sendmail(sender, recipients, message)
    print "Successfully sent email"
except SMTPException:
    print "Error: unable to send email"

Configuring Java for CritSend's SMTP Relay

This java code can be used to send a CritSend SMTP email.

import java.io.*;
import java.net.InetAddress;
import java.util.Properties;
import java.util.Date;

import javax.mail.*;

import javax.mail.internet.*;

import com.sun.mail.smtp.*;


public class Distribution {

    public static void main(String args[]) throws Exception {
        Properties props = System.getProperties();
        props.put("mail.smtps.host","smtp.critsend.com");
        props.put("mail.smtps.auth","true");
        Session session = Session.getInstance(props, null);
        Message msg = new MimeMessage(session);
        msg.setFrom(new InternetAddress("your_email@example.com"));;
        msg.setRecipients(Message.RecipientType.TO,
        InternetAddress.parse("Recipient_address@example.com", false));

        msg.setSubject("Your subject here "+System.currentTimeMillis());
        msg.setText("Your content here");
        msg.setHeader("X-Mailer", "Header");

        msg.setSentDate(new Date());

        SMTPTransport t =
            (SMTPTransport)session.getTransport("smtps");
        t.connect("smtp.critsend.com", "YourCritSendUsername", "YourCritSendPassword");
        t.sendMessage(msg, msg.getAllRecipients());
        System.out.println("Response: " + t.getLastServerResponse());
        t.close();
    }
}

Configuring PHP List for CritSend's SMTP Relay

Using PHP List you can setup for mail to be sent to the CritSend SMTP relay. You can setup PHP List for the CritSend SMTP relay by editing the various configuration and administration pages.

In lists/config/config.php the following lines should look like:

define ("TEST",0);
define("PHPMAILERHOST",'smtp.critsend.com');
$phpmailer_smtpuser = '';
$phpmailer_smtppassword = '';
$phpmailer_smtpsecure = 'tls';
$phpmailer_smtpport = '25';

In /lists/admin/class.phplistmailer.php replace the if statement after "$this->Host = PHPMAILERHOST;" with this:

$this->Username = $GLOBALS['phpmailer_smtpuser'];
$this->Password = $GLOBALS['phpmailer_smtppassword'];
$this->SMTPSecure = $GLOBALS['phpmailer_smtpsecure'];
$this->Port = $GLOBALS['phpmailer_smtpport'];

Finally, In /lists/admin/phpmailer/class.smtp.php:
Replace:

$this->smtp_conn = fsockopen($host, # the host of the server

With:

$this->smtp_conn = fsockopen($host='tls://smtp.critsend.com',

Configuring Interspire for CritSend's SMTP Relay

Using Interspire Email Marketer you can setup for mail to be sent to the CritSend SMTP relay. You can setup Intersprire for the CritSend SMTP relay by editing the settings page. You must select 'Use SMTP Server'.

SMTP Hostname: smtp.critsend.com
SMTP Username: CritSend_username
SMTP Password: CritSend_password
SMTP Port: 25

Here is a screenshot of the setup page:

Configuring Sendblaster for CritSend's SMTP Relay

SendBlaster can be configured to use CritSend's SMTP relay. To do so you must be using the SMTP server option, not Direct send. The configuration is as follows:

SMTP Hostname: smtp.critsend.com
SMTP Username: YourCritSendUsername
SMTP Password: YourCritSendPassword
SMTP Port: 25

Configuring Expression Engine for CritSend's SMTP Relay

Using Expression Engine you can setup for mail to be sent to the CritSend SMTP relay. You can setup Expression Engine for the CritSend SMTP relay by editing the Admin/Email configuration page. Select SMTP as the email protocol. The three settings are as follows:

SMTP Server Address: smtp.critsend.com
SMTP Username: YourCritSendUsername
SMTP Password: YourCritSendPassword

Setup