What are common issues when sending emails to addresses outside the host using PHP?

Common issues when sending emails to addresses outside the host using PHP include emails being marked as spam, emails not being delivered, and incorrect email formatting. To solve these issues, ensure that the email headers are correctly set, use a reliable SMTP server to send emails, and properly format the email content. 

// Example PHP code snippet to send an email using a reliable SMTP server

$to = 'recipient@example.com';
$subject = 'Test Email';
$message = 'This is a test email sent from PHP.';
$headers = 'From: yourname@example.com' . "\r\n" .
    'Reply-To: yourname@example.com' . "\r\n" .
    'X-Mailer: PHP/' . phpversion();

// Set the SMTP server settings
ini_set('SMTP', 'smtp.example.com');
ini_set('smtp_port', 25);

// Send the email
mail($to, $subject, $message, $headers);

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