_http://ibssg.org/blacksheep/faq.html#3_ (http://ibssg.org/blacksheep/faq.html#3) frequent asked questions What is the difference between list mode and digest mode? When you subscribe to List mode (l) you will receive each post to the list individually. This can add up to a lot of mail. When you subscribe to Digest mode (d) you will receive one email approx. every 12 hours. Digest mode will lump all the posts to the list into one letter.