We use a combined method of notices on the mailbox (interior low-rise), an email or text message depending on their preference, and a courtesy call if they've not picked up after a few days.
I was doing some research when we were converting to Yardi and found some integrated services like Notifii, Logware, and PackageZen. There's a wealth of services out there, and some of them are fairly inexpensive. All you do then is just enter the package arrival into Yardi (if you want to get tech-y, you get a barcode scanner and scan it in!) and it will automatically send the notices out.
We're small enough we didn't bother with the integrated systems, but let me know if it works out! I'm always interested in making things easier!