Hi I need assist with docker and SMTP server.am new to docker.

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PHP

docker

I need assistance with smtp when i run the below code using localhost (xampp) it send emails but when I run in on the docker image it give me this error message:

SMTP NOTICE: EOF caught while checking if connected 2022-01-27 09:18:14 SMTP Error: Could not connect to SMTP host. 2022-01-27 09:18:14 SMTP connect() failed.

This is the code:
require 'PHPMailerAutoload.php';

$mail = new PHPMailer;
$mail->isSMTP();
$mail->Host = "smtp.Office365.com";
$mail->Port = 587;
$mail->SMTPDebug = 2;
$mail->SMTPSecure = 'tls';
$mail->SMTPAuth = true;
$mail->CharSet = "UTF-8";
$mail->Username = "emailaddress";
$mail->Password = "password";

$email = "to:email adress";


$mail->Fromname = "Docker";
$mail->addAddress($email);

$mail->isHTML(true);

$mail->Subject = 'Test email Docker';
$message = '

<title>Test email

Hello!!!!!!!

';
$mail->msgHTML($message);



if (!$mail->send()) {

echo "Mail failed***********";
} else {

echo "mail sent!!!!!!!!!!!!";
}

What I have tried:

I tried adding the below on my docker file but still got the error message.

RUN apt-get install -q -y ssmtp mailutils


RUN echo "root=emailaddress" >> /etc/ssmtp/ssmtp.conf

# Here is the gmail configuration (or change it to your private smtp server)
RUN echo "mailhub=smtp.office365.com:587" >> /etc/ssmtp/ssmtp.conf
RUN echo "AuthUser=emailaddress" >> /etc/ssmtp/ssmtp.conf
RUN echo "AuthPass=password" >> /etc/ssmtp/ssmtp.conf

RUN echo "UseTLS=YES" >> /etc/ssmtp/ssmtp.conf
RUN echo "UseSTARTTLS=YES" >> /etc/ssmtp/ssmtp.conf


# Set up php sendmail config
RUN echo "sendmail_path=sendmail -i -t" >> /usr/local/etc/php/conf.d/php-sendmail.ini