Invalid “Reply-To” e-mail address

This was asked many times, and I checked all the answers, but still no use for our case:

We are using PostSMTP mailer type, and all is good, BUT:

When customer inputs invalid e-mail, like ‘something@gmail.com44’ or ‘something@yahoo.con’, then notification is NOT sent to webshop manager.

It is sent to administrator e-mail, but webshop manager would like to know about it via e-mail also.

We have ‘Disable e-mail validation’ unchecked, but wrong e-mails still popup from time to time.

Solution would be:
1. To add another e-mail validation on top of that, so this doesn’t happen OR
2. If you can add e-mail notification about failed e-email to another e-mail besides ‘Administrator E-mail Address’, since there can only be 1

And I don’t want to add webshop manager as administrator, so I have to message him about failed e-mails everytime now.

I hope I was clear on the issue ??

Thanks for the answer/proposed solution/whatever,

regards,
Tadej