I'm thinking twice of using autoresponders for e-mail queries.

I've been in constant communication with this guy who uses autoresponders and it's just quite annoying. By the time I'm eager to open his mail to read his response, it gets me when the e-mail turns out be just an autoresponse.

I'm thinking something like "Thank you for contacting us. We will respond to your e-mail within 24 hours....." you know, the usual thing.
What are your thoughts on autoresponders?