What are common issues with sending emails using the mail() function in PHP?

One common issue with sending emails using the mail() function in PHP is that emails may end up in the recipient's spam folder. This can happen if the email headers are not properly set or if the email content triggers spam filters. To solve this, make sure to set appropriate headers, such as From, Reply-To, and MIME type, and ensure that the email content is not flagged as spam. 

$to = "recipient@example.com";
$subject = "Test Email";
$message = "This is a test email.";
$headers = "From: sender@example.com\r\n";
$headers .= "Reply-To: sender@example.com\r\n";
$headers .= "MIME-Version: 1.0\r\n";
$headers .= "Content-Type: text/html; charset=ISO-8859-1\r\n";

mail($to, $subject, $message, $headers);

Keywords

mail function SMTP server spam folder email headers error handling

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