What are common issues that may prevent a PHP newsletter script from sending emails successfully?

One common issue that may prevent a PHP newsletter script from sending emails successfully is misconfigured SMTP settings. Make sure that the SMTP server, port, username, and password are correctly set in the script. Additionally, check for any spam filters that may be blocking the emails from being sent. 

// Example code snippet to set SMTP settings in PHP
$to = "recipient@example.com";
$subject = "Test Email";
$message = "This is a test email.";
$headers = "From: sender@example.com";

// Set SMTP settings
ini_set("SMTP", "smtp.example.com");
ini_set("smtp_port", "587");
ini_set("sendmail_from", "sender@example.com");

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

Keywords

SMTP PHPMailer SPF DKIM spam folder

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