Newsletters are recurring, meaning your email list expects to see them regularly. A general rule of thumb is to send out a newsletter at least once a month and no more than twice a week. If your newsletters are chock-full of helpful content, broken into sections like a magazine, you can send them out once a quarter. In the B2B sphere, it’s best to send newsletters on weekdays at the beginning of the week, when your customers are likely to check their emails. A newsletter isn’t aiming for a hard sell. When you send a newsletter, it goes to your established customers. It’s a great avenue to announce company updates and other information relevant to those already familiar with your services. It’s also a great place to discuss relevant industry topics.