I have idea that may help you without using php customization. It's very simple & robust method.
- Create a shop e-mail, for example, [email protected]
- Then in cPanel in E-mail > Forwarder > Add Forwarder to needed e-mails (1, 2, 3, 4)
Then each time e-mail [email protected] get a message the same message will get also: email-01@, email-02@, email-03@ etc. You need 3min to set everything. Here is screenshot from popular cPanel v10.0.

Of course if you have different Hosting Panel - just check options /or/ ask Hosting Support.
And Yes, I used that method a few times in last years, and all worked well and still does.