Php mail basic function

sendmail.php

<?php
// the message
   ini_set('display_errors', 1);
   ini_set('display_startup_errors', 1);
   error_reporting(E_ALL);

$send_email = "moshiur.swe@gmail.com";
// the message
$to = "$send_email"; // note the comma

// Subject
$subject = "Sample Request";

// All post variables


// Message
//$message = "Download Link: http://pdf.ajes.com/r-$myfinal[1].pdf";

$content = '
    <h3>You have received sample request from customer</h3>
    <h3 style="text-align=center;">Customer Information</h3>
    <table style="font-family: arial, sans-serif;
        border-collapse: collapse;
        width: 70%;">
        <tr style="border-bottom: 1px solid #dddddd;border-top: 1px solid #dddddd;" style="border-bottom: 1px solid #dddddd;">
            <th style="text-align:left;border-left:1px solid #dddddd;border-right:1px solid #dddddd;width:40%;padding: 7px;">Info</th>
            <th style="border-right:1px solid #dddddd;padding: 7px;">details</th>
           
        </tr>
        <tr style="border-bottom: 1px solid #dddddd;">
            <th style="text-align:left;border-left:1px solid #dddddd;border-right:1px solid #dddddd;width:40%;padding: 7px;">Company/ Store name</th>
            <td style="border-right:1px solid #dddddd;padding: 7px;">Maria Anders</td>
        </tr>
        <tr style="border-bottom: 1px solid #dddddd;">
            <th style="text-align:left;border-left:1px solid #dddddd;border-right:1px solid #dddddd;width:40%;padding: 7px;">Website /Social media account ID</th>
            <td style="border-right:1px solid #dddddd;padding: 7px;">Francisco Chang</td>
        </tr>
        <tr style="border-bottom: 1px solid #dddddd;">
            <th style="text-align:left;border-left:1px solid #dddddd;border-right:1px solid #dddddd;width:40%;padding: 7px;">First name </th>
            <td style="border-right:1px solid #dddddd;padding: 7px;">Roland Mendel</td>
        </tr>
        <tr style="border-bottom: 1px solid #dddddd;">
            <th style="text-align:left;border-left:1px solid #dddddd;border-right:1px solid #dddddd;width:40%;padding: 7px;">Last name</th>
            <td style="border-right:1px solid #dddddd;padding: 7px;">Helen Bennett</td>
        </tr>
        <tr style="border-bottom: 1px solid #dddddd;">
            <th style="text-align:left;;border-left:1px solid #dddddd;border-right:1px solid #dddddd;width:40%;padding: 7px;">Email address</th>
            <td style="border-right:1px solid #dddddd;padding: 7px;">Yoshi Tannamuri</td>
        </tr>
        <tr style="border-bottom: 1px solid #dddddd;">
            <th style="text-align:left;border-left:1px solid #dddddd;border-right:1px solid #dddddd;width:40%;padding: 7px;">Telephone</th>
            <td style="border-right:1px solid #dddddd;padding: 7px;">Giovanni Rovelli</td>
        </tr>
         <tr style="border-bottom: 1px solid #dddddd;">
            <th style="text-align:left;border-left:1px solid #dddddd;border-right:1px solid #dddddd;width:40%;padding: 7px;">Delivery address</th>
            <td style="border-right:1px solid #dddddd;padding: 7px;">Giovanni Rovelli</td>
        </tr>
         <tr style="border-bottom: 1px solid #dddddd;">
            <th style="text-align:left;border-left:1px solid #dddddd;border-right:1px solid #dddddd;width:40%;padding: 7px;">Postcode / ZIP Code </th>
            <td style="border-right:1px solid #dddddd;padding: 7px;">Giovanni Rovelli</td>
        </tr>
    </table>

    <h3 style="text-align=center;">Sample Information</h3>

    <table style="font-family: arial, sans-serif;
        border-collapse: collapse;
        width: 70%;">
        <tr style="border-bottom: 1px solid #dddddd;border-top: 1px solid #dddddd;" style="border-bottom: 1px solid #dddddd;">
            <th style="text-align:left;border-left:1px solid #dddddd;border-right:1px solid #dddddd;width:40%;padding: 7px;">Product Code</th>
            <th style="border-right:1px solid #dddddd;padding: 7px;">Title</th>
            <th style="border-right:1px solid #dddddd;padding: 7px;">Quantity</th>
            <th style="border-right:1px solid #dddddd;padding: 7px;">Sample price</th>
            <th style="border-right:1px solid #dddddd;padding: 7px;">total</th>
        </tr>
        <tr style="border-bottom: 1px solid #dddddd;">
            <th colspan="3" style="text-align:center;border-left:1px solid #dddddd;border-right:1px solid #dddddd;width:40%;padding: 7px;">Total </th>
            <td style="text-align:right;border-right:1px solid #dddddd;padding: 7px;">Total</td>
            <td style="border-right:1px solid #dddddd;padding: 7px;">1112</td>
        </tr>
    </table>
    ';



// To send HTML mail, the Content-type header must be set
$headers[] = 'From: admin@omakasejp.com';
$headers[] = 'MIME-Version: 1.0';
$headers[] = 'Content-type: text/html; charset=iso-8859-1';

// Mail it
$retval = mail($to, $subject, $content, implode("\r\n", $headers));

if( $retval == true ) {
    echo "Message sent successfully...";
 }else {
    echo "Message could not be sent...";
 }
?>