I have a problem and I would like a couple of tips from you. I have a corporate email @ example.info relating to my example.info website hosted on godaddy. I have searched on google but I have not found any guides on the matter, how can I create a php code on my centos 8 server that sends a preset newsletter when I decide it? 1- I just need to know if it is possible to link my php code to an @ example.info externa email and how to do it. 2- Furthermore, I would need to know how to send a newsletter to more than 8 thousand people without being entered as spam by google or other such problems. I opted for this solution because I found on the internet that gmail doesn't allow you to send more than 100 emails automatically or something like that, so I created my own email to do the same thing but bypass the limitation. Anyone who can explain to me how to do or link me a guide, is welcome. Thank you

CodePudding user response：

You may use phpmailer library to easily send mail thru an external SMTP server, but if you do not want to use phpmailer, use the following PHP function:

<?php  

function authMail($from, $namefrom, $to, $nameto, $subject, $message){
/*  your configuration here  */

$smtpServer = "XX.XX.XX.XXXX"; //ip accepted as well
$username = "xxxxxxx"; //the login for your smtp
$password = "xxxxxxx"; //the pass for your smtp


$port = "25"; // should be 25 by default
$timeout = "60"; //typical timeout. try 45 for slow servers

$localhost = "127.0.0.1"; //this seems to work always
$newLine = "\r\n"; //var just for nelines in MS
$secure = 0; //change to 1 if you need a secure connect
  
/*  you shouldn't need to mod anything else */

//connect to the host and port
$smtpConnect = fsockopen($smtpServer, $port, $errno, $errstr, $timeout);
$smtpResponse = fgets($smtpConnect, 4096);
if(empty($smtpConnect))
{
   $output = "Failed to connect: $smtpResponse";
   return $output;
}
else
{
   $logArray['connection'] = "Connected to: $smtpResponse";
}

//say HELO to our little friend
fputs($smtpConnect, "HELO $localhost". $newLine);
$smtpResponse = fgets($smtpConnect, 4096);
$logArray['heloresponse'] = "$smtpResponse";

//start a tls session if needed 
if($secure)
{
   fputs($smtpConnect, "STARTTLS". $newLine);
   $smtpResponse = fgets($smtpConnect, 4096);
   $logArray['tlsresponse'] = "$smtpResponse";

   //you have to say HELO again after TLS is started
   fputs($smtpConnect, "HELO $localhost". $newLine);
   $smtpResponse = fgets($smtpConnect, 4096);
   $logArray['heloresponse2'] = "$smtpResponse";
}

//request for auth login
fputs($smtpConnect,"AUTH LOGIN" . $newLine);
$smtpResponse = fgets($smtpConnect, 4096);
$logArray['authrequest'] = "$smtpResponse";

//send the username
fputs($smtpConnect, base64_encode($username) . $newLine);
$smtpResponse = fgets($smtpConnect, 4096);
$logArray['authusername'] = "$smtpResponse";

//send the password
fputs($smtpConnect, base64_encode($password) . $newLine);
$smtpResponse = fgets($smtpConnect, 4096);
$logArray['authpassword'] = "$smtpResponse";

//email from
fputs($smtpConnect, "MAIL FROM: $from" . $newLine);
$smtpResponse = fgets($smtpConnect, 4096);
$logArray['mailfromresponse'] = "$smtpResponse";


//email to
fputs($smtpConnect, "RCPT TO: $to" . $newLine);

$smtpResponse = fgets($smtpConnect, 4096);
$logArray['mailtoresponse'] = "$smtpResponse";

//the email
fputs($smtpConnect, "DATA" . $newLine);
$smtpResponse = fgets($smtpConnect, 4096);
$logArray['data1response'] = "$smtpResponse";

//construct headers
$headers = "MIME-Version: 1.0" . $newLine;
$headers .= "Content-type: text/html; charset=utf-8" . $newLine;
//$headers .= "To: $nameto <$to>" . $newLine;
$headers .= "From: $namefrom <$from>" . $newLine;


//observe the . after the newline, it signals the end of message
fputs($smtpConnect, "To: $to\r\nSubject: $subject\r\n$headers\r\n\r\n$message\r\n.\r\n");
$smtpResponse = fgets($smtpConnect, 4096);
$logArray['data2response'] = "$smtpResponse";

// say goodbye
fputs($smtpConnect,"QUIT" . $newLine);
$smtpResponse = fgets($smtpConnect, 4096);
$logArray['quitresponse'] = "$smtpResponse";
$logArray['quitcode'] = substr($smtpResponse,0,3);
fclose($smtpConnect);
//a return value of 221 in $retVal["quitcode"] is a success 
return($logArray);
}


?>