It's not all about volume!
You may think that playing the numbers games is something that we would promote (ie the more emails you send the more money we can earn). Well we don't believe in this approach, we would rather see our clients sending smaller volumes that are much more targeted and relevant to their audiences.
What about if you have purchased a large database? Absolutely use little green plane to send email to this database, however our advice would be learn from the statistics to understand the behaviour of your recipients. With this level of understanding you can begin to start profiling and segmenting your data into much more relevant campaigns, therefore quickly moving away from the scatter gun approach.
Obviously the quality of your database will also affect a major effect on the performance of your campaigns. As you would expect home grown data should provide you with our biggest rewards.