Email or SMS alert when someone visits landing page

I'm doing some offline marketing, with very custom direct mail. Each mail piece I am sending has a personalized URL (Purl) for a custom landing page and a dedicated login/password for that landing page.

What I am looking for is to have an alert sent to me (realtime) when someone logins to their Purl. An email will work, but an SMS would be better. I want to be able to call the person a few minutes after they view their Purl.

I know there are some Purl vendors, but they are pricey and I am doing this on a very small scale (less then 100).

The site is a wordpress.

You could do that with php. Let php send an email when someone hits the requested page. Or when you subscribe to an sms provider you could let php send an sms through your sms provider.

Email - Easy. just use php's mail function if using php.
SMS - Easy if you can spend money. You will need to integrate the api though.

Php would be easy.
php script that sends an email when it's run.
SMS harder, unless you find email to SMS service. Or maybe that company, can't remember the name but it links different things and different services together...

Thank you.

Sorry but I'm more of a marketer then web programer. Can you recommend any resources I can look at for the php email.