You have a list and you communicate with them using regular mail (yes even Google sends marketing in the mail) and email. Here is a tip to get more clicks on your offers.
Drive people to personalized content.
What do I mean by personalized content?
Personalized URLS (PURLs)
Instead of sending Richard Jones to www.specialoffer.com send him to www.specialoffer.com/Richard Jones.
Personal Urls are sure to get the attention of your prospect. Then make the offer a personalized offer directly to Richard. This technique can be used in your direct mail and your email marketing campaigns to your list. The personal Url's make it easy for your to track the effectiveness of your offline and online marketing.
Personalized URLS (PURLS) have been found to increase your response rate.
Don't just take my word, test it for yourself.
Tools For Creating Personal URLs
Elegant Purl – I recommend Elegant Purl Pro for creating Personal Url's for your WordPress Powered site.
Purlem – Not originally built for use with WordPress but they offer a plugin.
Simple Purls – I have no experience using Simple Purls but it is built on WordPress