Why Are My PHP `mail()` Emails Going to Spam, and How Can I Fix It?

Troubleshooting "Mail() to Spam" Issues in PHP

When utilizing PHP's mail() function for email delivery, you might encounter instances where your emails consistently land in spam folders, particularly in Gmail. Despite employing various recommended tips, the issue persists.

Sure-Shot Trick for Preventing Spam Classification

The key to preventing mail() emails from being flagged as spam is to incorporate the necessary message headers. These headers provide additional information to email servers, helping them determine the legitimacy of the sender and prioritize the email accordingly.

Implementing the Headers

The following code demonstrates how to append essential headers to your PHP mail() function:

$headers = "From: [email protected]\r\n";
$headers .= "Reply-To: [email protected]\r\n";
$headers .= "Return-Path: [email protected]\r\n";
$headers .= "CC: [email protected]\r\n";
$headers .= "BCC: [email protected]\r\n";

if (mail($to, $subject, $message, $headers)) {
    echo "The email has been sent!";
} else {
    echo "The email has failed!";
}

Specifically, the following headers are recommended:

• From: Specifies the sender's email address.
• Reply-To: Designates the email address to use for replies.
• Return-Path: Sets the return path for bounce notifications.
• CC: Includes carbon copies of the email.
• BCC: Includes blind carbon copies of the email.

By adding these headers to your mail() call, you provide additional context and assist email servers in recognizing your emails as legitimate and non-spam. As a result, your emails should reach their intended recipients' inboxes as intended.

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