Command line to send an automated mail?

[europacafe]

I run snappymail as a container (+stalwart mail server) and I love it. I use a SMTP relay service provider for all outgoing mails to ensure my mail is not put in their spam mailboxes.

I would like to automatically send a mail to those mailboxes (yahoo, gmail, outlook) weekly so that the SMTP relay service sees I'm still an active account.

If possible, I want to use a command line to send such mail and use cron to schedule the sending. Could you give a few examples of command line?

Thank you

[the-djmaze]

SnappyMail can't.
But you could write a PHP shell script to run in cron that uses https://php.net/mail or a more advanced php library.
Or attempt with:

#!/usr/bin/php
<?php
$_ENV['SNAPPYMAIL_INCLUDE_AS_API'] = true;
require '/path/to/snappymail/index.php';

	$SmtpSettings = \MailSo\Smtp\Settings::fromArray([
		'host' => 'localhost',
		'port' => 143,
		'type' => \MailSo\Net\Enumerations\ConnectionSecurityType::NONE,
		'ssl' => []
	]);
/*
	$SmtpSettings->Login = 'myusername';
	$SmtpSettings->Password = 'mypassphrase';
	$SmtpSettings->useAuth = true;
*/
	$oSmtpClient = new \MailSo\Smtp\SmtpClient;
	$oSmtpClient->SetLogger(\RainLoop\API::Logger());
	$oSmtpClient->Connect($SmtpSettings);
//	$oSmtpClient->Login($SmtpSettings);
	$oSmtpClient->MailFrom('me@domain.tld');
	$oSmtpClient->Rcpt('me@gmail.com');
	$oSmtpClient->Data('contents of message.eml');

[europacafe]

Thank you for the code and additional suggestions. I am eager to try out the code provided, but I have some questions:

1. as I run snappymail as a container, where should I put this php file?
2. for the $oSmtpClient->Data('contents of message.eml');, I've created a new email, with snappymail, and saved it in the draft folder, from which I've saved the email as an .eml file. Where should I place this file, and how do I specify the path to it?

Currently, I have configured my debian server to automatically send emails using PHP code that utilizes PHPMailer and a cron job.

<?php
// PHPMailer classes into the global namespace
use PHPMailer\PHPMailer\PHPMailer; 
use PHPMailer\PHPMailer\Exception;
// Base files 
require './PHPMailer/src/Exception.php';
require './PHPMailer/src/PHPMailer.php';
require './PHPMailer/src/SMTP.php';
// create object of PHPMailer class with boolean parameter which sets/unsets exception.
$mail = new PHPMailer(true);                              
try {
    $mail->isSMTP(); // using SMTP protocol                                     
    $mail->Host = 'mail.mydomain.com'; // SMTP host as mydomain 
    $mail->SMTPAuth = true;  // enable smtp authentication                             
    $mail->Username = 'xxx@mydomain.com';  // sender mydomain host              
    $mail->Password = 'xxx...xxxx'; // sender mydomain host password                          
    $mail->SMTPSecure = 'tls';  // for encrypted connection                           
    $mail->Port = 587;   // port for SMTP     

    $mail->setFrom('xxx@mydomain.com', "Chote"); // sender's email and name
    $mail->addAddress('xxx@gmail.com', "gmail");  // receiver's email and name
    $mail->addAddress('xxx@yahoo.com', "yahoo");  // receiver's email and name
    $mail->addAddress('xxx@outlook.com', "outlook");  // receiver's email and name
    $mail->AddCC('relay.servers@mydomain.com', 'Relay SMTP');

    $mail->Subject = 'You assignment will be due today by 6pm';
    $mail->Body    = 'Otherwise, you will get no mark';

    $mail->send();
    echo 'Message has been sent';
    } 
catch (Exception $e) { // handle error.
    echo 'Message could not be sent. Mailer Error: ', $mail->ErrorInfo;
}
//cronjob: every Sunday 0.00 (last digit in cronjob = 0 is Sunday
//0 0 * * 0 /usr/bin/php -f /home/bthoven/sendmail_smtprelay.php &> /dev/null
?>

Thank you very much