In job-manager/frontend-application.php around line 921 you will find the email that is sent.
Around line 952
$msg .= $field['label'] . ': ' . $appdata['data'.$id] . PHP_EOL;
Add “\n” where you want to add your line break. Your code then becomes
$msg .= $field['label'] . ': ' . $appdata['data'.$id] . "\n" . PHP_EOL;
You can add the “\n” to the text area and file .msg lines as well. This will space the email rather nicely.
To further customize mine, I use vars to hold my html formatting and add it into the above lines.
$boldspan ='<span style="font-weight: bold; font-size: 12px;">';
$endboldspan ='</span>';
and then
$msg .= $boldspan . $field['label'] . ': ' . $endboldspan . $appdata['data'.$id] . "\n" . PHP_EOL;
Hope this helps ??