Who ever said an envelope could only contain mailing and return addresses? Use blank space to call special attention to what's inside. Mailing for a college funding organization, we place an impact statement on the envelope that reads "College Funding mailing list Information Enclosed". If your child is planning to enter college, you will want to open the envelope and find out what funding options are available.
Timing: If mailing a sale notification, plan your mail piece to arrive about 1 week before the event. Allowing the recipient enough time to mailing list make plans to attend, but not so much time that they forget about the event. If sending notification for a business meeting requiring advanced registration, inform them of the event several months in advance.
You should then mail them information that will allow about 1 month to respond, and then a last minute reminder to arrive about 1-2 weeks prior to the event. Repeat, Repeat, Repeat: "Repetition breeds Memory". Recipients mailing list typically need to hear from you repeatedly for you to experience the best response. Plan on keeping in touch with your current customers on a quarterly basis and try to get in front of new customers 4-6 times per year.