[exim] Email alias with plus addressing

Hello,

I am running Exim 4.63 on WHM 10.8.0 cPanel 10.9.1-S14304 and RedHat
Enterprise 3 i686 - WHM X v3.1.0.

I would like to begin using email addresses that have a local part
suffix, reply+372943@??? for example. Within
/etc/valiases/mydomain.com, the following lines is present along with
others aliases:

reply@???: "|/home/user/reply.php"
*: :fail: No Such User Here

The php script is setup to be executable and executes correctly when an
email is sent to reply@???. I do not plan on having a reply
mailbox defined on mydomain.com, but can do so if it's necessary. Can
someone please assist me so email can be received at reply+*@????

Thanks,
Ryan