Most newsletters come out on a schedule that suits the creator. Daily. Weekly. Fortnightly. Monthly. Occasionally.
What if you as the recipient could choose?
I currently send my newsletter weekly, with one issue per month as a round-up of links to things I've found interesting, appealing or useful. If I added a list of my writing from the month to the link round-up I would be able to give readers the option to receive the newsletter either weekly or monthly. Either way they would receive the same content but on a frequency they preferred.
Do you offer this option already? I'd love to see some examples.