Always set reasonable expectations for your campaign and allow yourself to be pleasantly surprised if the email blast outperforms those expectations.
Let's say you send out 5,000 postcards to the addresses on the mailing list you rent. If you received just a 1% to 3% response rate (50 to 150 responses), it would be a highly successful campaign. With consumer email, your open rate could be 2 - 4%, in some cases even higher than a direct mailing, with response rates that could be far lower with a 0.25% to 2% response rate indicative of a solid mailing. Fortunately, most companies find that they can achieve solid ROI even with very low response rates. Often, it is a matter of working with us to tweak your campaign for optimum results and success.
Here's a final tip: Since email marketing is more affordable, you can reach out more to more people than a traditional direct mail campaign.