Why Are My PHP Emails Ending Up in Spam Folders?

Preventing Sent Emails from Landing in Spam Using PHP mail Function

You have encountered an issue where emails sent via your PHP script are being marked as junk mail. To address this, let's examine the factors that influence email classification as spam.

Common Causes of Junk Mail

• Inadequate email headers
• Use of suspicious words or phrases in the content
• Excessive use of HTML or images
• Lack of proper sender authentication

PHP Mail Headers

In your provided code, the header section looks accurate. One possible improvement is to explicitly define the "From" address using the "-f" flag in the mail function call. This method can help in authentication and prevent the email from being flagged as spam:

<code class="php">$headers ="From:<$from>\n";
$headers.="MIME-Version: 1.0\n";
$headers.="Content-type: text/html; charset=iso 8859-1";

mail($to,$subject,$body,$headers,"-f$from");</code>

Additional Tips

• Avoid using words or phrases that trigger spam filters, such as "free," "urgent," or "click here."
• Use HTML and images sparingly. Overuse can make your email appear more like an advertisement.
• Implement double opt-in for your mailing lists to ensure that subscribers explicitly consent to receive emails.
• Use an email service provider or plugin that provides advanced spam protection features.

By following these guidelines and testing your emails thoroughly, you can increase the likelihood that they will reach their intended recipients without getting caught in the spam filter.

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