What potential issues can arise when using PHP to send emails with attachments?

One potential issue when sending emails with attachments in PHP is that the email may not be delivered successfully if the attachment file size is too large. To solve this issue, you can set the maximum file size limit for attachments in your PHP code. 

// Set maximum file size limit for attachments
$maxFileSize = 5 * 1024 * 1024; // 5MB

// Check if attachment file size exceeds the limit
if ($_FILES['attachment']['size'] > $maxFileSize) {
    echo "Attachment file size exceeds the limit of 5MB.";
    exit;
}

Keywords

SMTP email attachments PHPMailer file upload MIME types

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