Are there any specific server settings, such as those in Debian and exim4, that could affect the sender address in PHP emails?

The issue could be related to the server's configuration settings for the mail server (such as exim4 in Debian) that may be overriding the sender address set in the PHP code. To solve this, you can explicitly set the sender address using the `additional_headers` parameter in the `mail()` function in PHP. 

$to = "recipient@example.com";
$subject = "Test Email";
$message = "This is a test email.";
$headers = "From: sender@example.com";

// Set sender address explicitly
$additional_headers = "From: sender@example.com";

// Send email
$mail_sent = mail($to, $subject, $message, $headers, $additional_headers);

if ($mail_sent) {
    echo "Email sent successfully.";
} else {
    echo "Email sending failed.";
}

Keywords

server settings Debian exim4 sender address PHP emails

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