Error: Sending email using PHP - php

Question

I had an error with the sending of an e-mail with php, because I have an smtp server name call smtp.office365.com, how should I try?
<?php
require "PHPmailer/src/PHPMailer.php";//Am I correctly include thelibraries?
require "PHPmailer/src/smtp.php";
$mail = new PHPMailer(true); >I get an error
$mail->isSMTP();
$mail->Host='smtp.office365.com';
$mail->Port=25;
$mail->SMTPAuth= true;
$mail->Username='username';//What username have I had to type?
$mail->Password='password';//The password is above office365 email?
$mail->SetFrom('sender_email', 'FromEmail');
$mail->addAddress('destination', 'ToEmail');
$mail->IsHTML(true);
$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';
?>
I get an error, because when I try to execute It on a server Linux It won't send the email and It gave me a 'HTTP ERROR 500'

Answer 1

$mail->Host=smtp.office365.com
$mail->Port=587
$mail->Username=XXXXXXX
$mail->Password=XXXXXXX
$mail->Encryption=tls

Answer 2

require "PHPmailer/src/PHPMailer.php";
require "PHPmailer/src/smtp.php";
$mail = new PHPMailer(); // create a new object
$mail->IsSMTP(); // enable SMTP
$mail->SMTPDebug = 0; // debugging: 1 = errors and messages, 2 = messages only
$mail->SMTPAuth = true; // authentication enabled
$mail->SMTPSecure = 'tls'; // secure transfer enabled REQUIRED for 365
$mail->Host = 'smtp.office365.com';
$mail->Port = 25;
$mail->Username = 'username';
$mail->Password = "password";
$mail->SetFrom($from, $from_name);
$mail->Subject = $subject;
$mail->Body = $body;
$mail->AddAddress('myemail#gmail.com');