To make sure you're only sending emails to the people who want to read them, clean up your email list so that it excludes recipients who haven't opened a certain amount of emails in the campaign's recent history. This makes sure your emails' open and clickthrough rates reflect only your most interested readers, allowing you to collect more effective data on what is and isn't working in each email you send.
“I love the quality I received from the solo ad I purchased from Elad. I ordered just 50 clicks and received 70, not only that, 56 of the clicks were from USA. It’s like buying a 100% tier 1 ad. I got 2 sales right away and 17 opt ins, and 2 more sales on back end. Never had this much success with a 300 or even 600 solo ad but a 50 click test run blew me away! Definitely going bigger next time and my repeated business is a must!!! Great Job.”
When you're using email as a marketing tool, you're working on a pretty personal basis. This isn't ‘drive-by' stuff -you're directly targeting customers from their inboxes. There's a huge amount of potential which comes with this kind of marketing... but you'll only reap that potential if you REALLY understand both the marketplace you're operating from, and the audience you're talking to.