The best day of the month to distribute an email newsletter depends on your audience. Generally, sending newsletters in the middle of the week, like Tuesday or Wednesday, tends to see higher engagement. People are usually settled into their week and more likely to open emails. Avoid sending newsletters during weekends or holidays when people may be less focused on their inbox. Early in the month can work well as people are more likely to open emails before their attention gets diverted later in the month. You should test different days and times to see what works best for your audience.