Yii2 SwiftMailer sends mails twice - php

Question

I write a game for football fans. So, I have to send similar mails to a group of people (not completely duplicated e-mail copies).
When I send the mails in a cycle - Yii framework sends the mails twice.
I suppose - it is because of the static variable Yii::$app.
Can someone give me a hint, please.
A code for example.
foreach ($oRace->user as $currUser) {
$htmlContent = $this->renderPartial('start_race', ['oRace' => $oRace]);
Yii::$app->mailer->compose()
->setFrom('info#example.com')
->setTo($currUser->mail)
->setSubject('Race "' . $raceName . '" has Started')
->setHtmlBody($htmlContent)
->send();
}
Thanks all in advance!
My Mailer config.
'mailer' => [
'class' => 'yii\swiftmailer\Mailer',
'useFileTransport' => false,
'transport' => [
'class' => 'Swift_SmtpTransport',
'host' => 'mail.example.eu',
'username' => 'support#example.com',
'password' => 'password',
'port' => '587',
'encryption' => 'TLS',
]
],
One more thing. The last mail in the cycle is never duplicated (only the last).
Another failed option.
Yii::$app->mailer->sendMultiple($allMails);

Answer 1

I recommend you to use CC or BCC option in the email instead of using foreach loop to send emails. I hope this will help someone.
$email = [];
foreach ($oRace->user as $currUser) {
$email[] = $currUser->mail;
}
$htmlContent = $this->renderPartial('start_race', ['oRace' => $oRace]);
Yii::$app->mailer->compose()
->setFrom('info#example.com')
->setCc($email) // If you're using Bcc use "setBcc()"
->setSubject('Race "' . $raceName . '" has Started')
->setHtmlBody($htmlContent)
->send();

Answer 2

From the provided code snippets, there are 3 possible reasons for that. Either:
$oRace->user contains every user twice
$currUser->mail contains the email twice like `email#example.com;email#example.com"
something is wrong inside the send function of SwiftMailer

Answer 3

After all - I have found that the issue was not with my Yii2 framework, but with my hosting mail server.
I have used https://github.com/ChangemakerStudios/Papercut for listening what my framework sends. It receives mails on port 25, while it listens for events on port 37804. It's a little bit confusing. Yii2 web.php simple configuration for local mail server is:
$config = [
'components' =>
'mailer' => [
'class' => 'yii\swiftmailer\Mailer',
'useFileTransport' => false,
'transport' => [
'class' => 'Swift_SmtpTransport',
'host' => 'localhost', // '127.0.0.1'
'port' => '25',
]
],
],
];
Thank of all, who have read my post!