Clickz: E-Mail: A Dialogue, Not Just Direct Marketing
Any communication with your customers should include the opportunity for them to make their voices heard. Never give them the impression you don't want to hear from them. Your customers use e-mail for dialogues with their friends, families, and coworkers. "Do not reply to this email" sends a clear message: You don't really care. You're really saying, If you have negative things to say, we don't want to hear you. We only care about your voice if you buy something or tell us we're great.
[…] The fact it gets a lot of responses, even though its e-mail says not to reply, proves the point: Customers need to express themselves. They will, too, whether you want them to or not. How can you deal with responses efficiently?