In cases where emails with attachments are not being received, what server-side configurations or restrictions should be considered when using PHP for file uploads?

When emails with attachments are not being received, it could be due to server-side configurations or restrictions on file uploads. To solve this issue, you should check the PHP settings for maximum file upload size, post_max_size, and upload_max_filesize. Make sure these values are set high enough to accommodate the size of the attachments being sent via email.

// Increase maximum file upload size
ini_set('upload_max_filesize', '20M');
ini_set('post_max_size', '20M');