To schedule email sends for optimal open and click-through rates based on the contacts' time zone from their address information, we first need a mechanism to resolve the contact's time zone based on their address, and then schedule the delivery at times that have historically shown higher engagement rates.
Here is a simplified implementation in PHP. The actual sending mechanism would depend on the specific emailing service or infrastructure you are using. This example does not include the actual email sending functionality but provides the logic required to schedule such sends.
First, you need a hypothetical `Contact` class with an address and a method to resolve the time zone from the address:
```php
class Contact {
&nbsp; &nbsp; public $email;
&nbsp; &nbsp; public $address; // A string representing the user's location
&nbsp; &nbsp;&nbsp;
&nbsp; &nbsp; public function getTimeZone() {
&nbsp; &nbsp; &nbsp; &nbsp; // A function that gets a timezone string based on address
&nbsp; &nbsp; &nbsp; &nbsp; // In the real world, this would likely involve geocoding the address to coordinates,
&nbsp; &nbsp; &nbsp; &nbsp; // then looking up the timezone with a service like Google Maps TimeZone API.
&nbsp; &nbsp; &nbsp; &nbsp; return 'America/New_York'; // Placeholder for example purposes
&nbsp; &nbsp; }
}
```
Then the `EmailScheduler` class, which does the scheduling:
```php
class EmailScheduler {
&nbsp; &nbsp; private $contacts; // An array of Contact instances