newsletter:   1. Daily   Daily newsletters require a significant commitment unless they are very short. Usually daily ezines consist of brief tips, quotes, or news updates.   If your newsletter will contain "evergreen" content (nice-to-know anytime information) you can create each installment in advance and put them into an autoresponder to be sent automatically.   2. Weekly   Most newsletters come in a weekly format. Most publishers will tell you that Tuesday, Wednesday, or Thursday are the best weekdays to send your ezine. On Monday you'll most likely compete with the weekend's spam and on Friday you'll be competing with the golf course.   Another thought is to send your ezine exactly seven days after their sign up day. The theory is that the day they signed up is the day that they are usually online surfing the net (this strategy is particularly effective using an autoresponder).   3. Bi-Weekly   One installment every two weeks is a comfortable period. Some marketers will tell you that every 21 days is the "right" customer contact period that doesn't abuse the reader and arrives right at the "forgetting" point. 4. Monthly   Once a month is just beyond the forgetting point. However, it is a convenient time period because it gives you a good "end-of-the-month" deadline to adhere to.   5. Quarterly   Sending your electronic newsletter quarterly is simply a waste of time. Why do it. You've nullified most of the benefits of having a newsletter if you're going to send it once every 90 days.   People will forget who you are and just delete your message when it arrives. You'll have a lot of unsubscribes.   6. Whenever   Sending your newsletter whenever you can is not optimal (unfortunately, this is my current operating schedule). The most effective newsletters follow a consistent delivery schedule.