Newsletters are an effective tool for businesses to collect email addresses, convert visitors into buyers, and keep in contact with existing customers. When customers purchase from a business but receive no follow up, they are more likely to purchase from competitors in the future. A regular newsletter prevents this by informing customers of new products and services, reminding them of your business, and strengthening the customer relationship. The frequency of newsletters depends on your business but generally once per week or twice per month works well. Newsletters should provide relevant industry news, tips, and announcements about your business to engage customers while clearly indicating that subscribers signed up and allowing them to unsubscribe.