An auto responder is generally more similar in content to a newsletter than it is to a direct sales email, though it combines many of the elements of both. The content can vary wildly though based on your industry segment and what you've promised subscribers. The most common type of auto responder content will be tips or advice, but you can also do great things with recipes, serial fiction pieces, inspirational quotes and a variety of other topics. Essentially, you are looking for content that will engage users over a period of time while also providing a platform to encourage sales of your product or service or visits to your website.
Online surveys: Consumers are asked to complete a survey, including their demographic information and product and lifestyle interests. This information is used as a sales lead for advertisers, who purchase the consumer's information if provided. The consumer may 'opt-in' to receive correspondence from the advertiser and is therefore considered a qualified lead.