Error in 'from' using site-wide contact form and multiple recipients

Problem/Motivation

When SMTP module is used and the site-wide contact form has multiple recipients designated, the "$from" variable is set to the value of the multiple recipient email addresses, triggering an error message ("'The submitted from address (@from) is not valid.').

The 'hack to fix reply-to issue' helps by setting a usable $reply variable, but it leaves the $from variable set as the value of the multiple email addresses.

Proposed resolution

Move the "$properfrom" section down, just after $headers['Reply-To'] is set, and set $from = $properFrom.

Patch to follow.