なぜphpMailerを使用してメールを送信中にエラーが発生しましたか？

Question

なぜphpMailerを使用してメールを送信中にエラーが発生しましたか？

<?php 
    require 'PHPMailerAutoload.php'; 

    $mail = new PHPMailer; 

    $mail->isSMTP();          // Set mailer to use SMTP 
    $mail->Host = 'smtp1.example.com;smtp2.example.com'; // Specify main and backup SMTP servers 
    $mail->SMTPAuth = true;        // Enable SMTP authentication 
    $mail->Username = 'user@example.com';     // SMTP username 
    $mail->Password = 'secret';       // SMTP password 
    $mail->SMTPSecure = 'tls';       // Enable encryption, 'ssl' also accepted 

    $mail->From = 'from@example.com'; 
    $mail->FromName = 'Mailer'; 
    $mail->addAddress('joe@example.net', 'Joe User');  // Add a recipient 
    $mail->addAddress('ellen@example.com');    // Name is optional 
    $mail->addReplyTo('info@example.com', 'Information'); 
    $mail->addCC('cc@example.com'); 
    $mail->addBCC('bcc@example.com'); 

    $mail->WordWrap = 50;         // Set word wrap to 50 characters 
    $mail->addAttachment('/var/tmp/file.tar.gz');   // Add attachments 
    $mail->addAttachment('/tmp/image.jpg', 'new.jpg'); // Optional name 
    $mail->isHTML(true);         // Set email format to HTML 

    $mail->Subject = 'Here is the subject'; 
    $mail->Body = 'This is the HTML message body <b>in bold!</b>'; 
    $mail->AltBody = 'This is the body in plain text for non-HTML mail clients'; 

    if(!$mail->send()) { 
     echo 'Message could not be sent.'; 
     echo 'Mailer Error: ' . $mail->ErrorInfo; 
    } else { 
     echo 'Message has been sent'; 
    } 

Message could not be sent.Mailer Error: SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting

Answer 1

<?php 

    $mailto = $_POST['mail_to']; 
    $mailsub = $_POST['mail_subject']; 
    $mailmsg = $_POST['mail_message']; 
    require 'includes/PHPMailer-master/PHPMailerAutoload.php'; 
    $mail = new PHPMailer(); 
    $mail ->IsSmtp(); 
    $mail ->SMTPDebug = 1; 
    $mail ->SMTPAuth = true; 
    $mail ->SMTPSecure = 'ssl'; 
    $mail ->Host = "smtp.gmail.com";//If Your sending accound server is gmail use this else change 
    $mail ->Port = 465; // or 587 
    $mail ->IsHTML(true); 
    $mail ->Username = "abc@gmail.com"; //use your sending mail accound address 
    $mail ->Password = "abc123"; //use the account password of the above used mail. 
    $mail ->SetFrom("abc@gmail.com");//use your sending mail accound address (Same) 
    $mail ->Subject = $mailsub; 
    $mail ->Body = $mailmsg; 
    $mail ->AddAddress($mailto); 

    if(!$mail->Send()){ 
     echo "Mail not Send"; 
    } 
    else{ 
     echo " Mail Send"; 
    } 
?> 

Tihsコードは、[SMTP接続（）の