How can PHP developers ensure that emails with attachments are delivered successfully, especially when switching hosting providers?

When switching hosting providers, PHP developers can ensure that emails with attachments are delivered successfully by checking the maximum upload size and adjusting it if necessary. They can also verify that the email server settings are correctly configured to handle attachments. Additionally, developers should test the email functionality thoroughly after the switch to ensure everything is working as expected. 

// Example PHP code to send an email with attachment
$to = "recipient@example.com";
$subject = "Email with Attachment";
$message = "Please see the attached file.";
$attachment = "path/to/attachment.pdf";

// Set the email headers
$headers = "From: sender@example.com\r\n";
$headers .= "MIME-Version: 1.0\r\n";
$headers .= "Content-Type: multipart/mixed; boundary=\"boundary\"\r\n";

// Read the attachment file
$file = file_get_contents($attachment);
$attachment = chunk_split(base64_encode($file));

// Create the email body
$body = "--boundary\r\n";
$body .= "Content-Type: text/plain; charset=\"utf-8\"\r\n";
$body .= "Content-Transfer-Encoding: 7bit\r\n\r\n";
$body .= $message . "\r\n\r\n";
$body .= "--boundary\r\n";
$body .= "Content-Type: application/pdf; name=\"attachment.pdf\"\r\n";
$body .= "Content-Transfer-Encoding: base64\r\n";
$body .= "Content-Disposition: attachment; filename=\"attachment.pdf\"\r\n\r\n";
$body .= $attachment . "\r\n";
$body .= "--boundary--";

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

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