Why is space removed before # in Laravel Mail?

My Mail Subject is "Brand1 #4 New ticket comment"

However, When I receive an email it remove a space before #. Something like this "Brand1#4 New ticket comment"

If I put any other special character like @, it work fine. Any Idea?

Below is the code where I create Subject String for Email.

$params['appName'].' #'.$support_ticket->id.' New ticket comment';

Any Idea what is the issue ?

via Chebli Mohamed