There are several effective ways to collect subscriber preferences:
1. Sign-Up Forms: Include options for frequency and types of content in your sign-up form. 2. Preference Centers: Create a [preference center](https://) where subscribers can easily update their choices. 3. Surveys: Periodically send out surveys to ask subscribers about their preferences. 4. Email Footers: Provide links in your email footers that allow subscribers to manage their preferences.