Cronjob is not running properly but work while run command (./)

I have this script for file testfile.sh:

SEND_EMAIL(){

TO="[email protected]"
CC_MAIL="[email protected]"

sendmail $TO,$CC_MAIL <<EOF
From: [email protected]
To: $TO
Cc: $CC_MAIL
Subject:Report
Content-Type: text/html;
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style type="text/css">
<!--
body,td,th,table {
        font-family: Verdana, Arial, Helvetica, sans-serif;
        font-size: 12px;
        empty-cells: show;
}
-->
</style>
</head>
<body>
Hi Team,<br><br>

Fyi, IT Operation repot<br>
<br>

<table cellpadding="0" cellspacing="0" border="1" bordercolor="black"  style="wi
dth: 500px">
        <tr bgcolor="silver"  align="center" style="font-weight:bold">
                <td>REPORTED_BY</td>
                <td>TICKET_ID</td>
                <td>HELP_TOPIC</td>
                <td>SUBJECT</td>
                <td>CREATION_DATE</td>
                <td>REOPENED</td>
                <td>EST_DUEDATE</td>
                <td>UPDATED</td>
                <td>PRIORITY</td>
                <td>USERNAME</td>
        </tr>
</table>
<br>
<br>

Regards,<br>

IT Team

</body>
</html>
EOF

}

In crontab, I have this line:

* * * * * /bin/sh /opt/testfile.sh

I have restarted crontab, but nothing is happening.

If I run with the command manually, like ./test8.sh, then I receive an email.

Why is this not working from crontab?


I solved it by adding the path /sbin/sendmail on the script

#!/bin/bash

SEND_EMAIL(){

TO="[email protected]"
CC_MAIL="[email protected]"

/sbin/sendmail $TO,$CC_MAIL <<EOF
From: [email protected]
To: $TO
Cc: $CC_MAIL
Subject:Report
Content-Type: text/html;
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style type="text/css">
<!--
body,td,th,table {
        font-family: Verdana, Arial, Helvetica, sans-serif;
        font-size: 12px;
        empty-cells: show;
}
-->
</style>
</head>
<body>
Hi Team,<br><br>

Fyi, IT Operation repot<br>
<br>

<table cellpadding="0" cellspacing="0" border="1" bordercolor="black"  style="wi
dth: 500px">
        <tr bgcolor="silver"  align="center" style="font-weight:bold">
                <td>REPORTED_BY</td>
                <td>TICKET_ID</td>
                <td>HELP_TOPIC</td>
                <td>SUBJECT</td>
                <td>CREATION_DATE</td>
                <td>REOPENED</td>
                <td>EST_DUEDATE</td>
                <td>UPDATED</td>
                <td>PRIORITY</td>
                <td>USERNAME</td>
        </tr>
</table>
<br>
<br>

Regards,<br>

IT Team

</body>
</html>
EOF


}
SEND_EMAIL