must respect the periodicity : respect the pre-established publication date (the same day of the week, more or less at the same time) and do not exaggerate with the sendings (one a week is usually sufficient)
How to write a newsletter
When designing a newsletter, the first thing you need to pay attention to is the subject : it is based on it and the name of the sender that users choose whether or not to open that email. Keep in mind that people generally have little time, and that they check their inbox from their cell phones perhaps while they are on the subway or while they are having breakfast.
The subject line should be short (also because many email clients automatically cut it), around 50 characters, it should pique the reader's curiosity and be special data consistent with the theme of the email. For example, if you are advertising the sale of a product, you could write in the subject line "offer + product name + duration". Smileys and emoticons are also welcome. Instead, avoid sentences in all capital letters, sensational terms and "spammy" expressions such as "free" or "the best".
Incisiveness , in truth, is a characteristic that the body of the newsletter must also have: it is important that the sentences are short and catchy, that the title is simple and that the content is original and engaging. The ideal is to divide the text into small paragraphs , written in a colloquial way (unless it is a business newsletter, aimed at companies) and designed to increase customer loyalty. Insert images, as long as they are bright and in high resolution, avoid mixing fonts together. And prefer slogans to long paragraphs. The goal is to stimulate user interaction , push them to perform an action by inserting buttons and hyperlinks. The call-to-action is the heart of the newsletter, and is the only element that allows you to evaluate whether your email has been effective or not.