Alert People Via Postal Code

Hello,

I would like to notify all users with the same postal code whenever a new listing is posted matching their postal code. I am just curious if you have absolutely any knowledge you could give me to give me a head start with this, I understand this request is outside of your scope of support.

I already made a postal code buddypress profile field that all users fill out on registration, I am just not sure about how I can call the listing postal codes to see if it matches the profile field.

https://wordpress.org/plugins/geodirectory/