Is your inbox light on spam? Do you need more art and stuff sent to you on a semi-regular basis?
Then sign up for Charles C Dowd's quarterly newsletter! You'll receive (as the name implies) a quarterly (that's 4 per year) newsletter with info on what Charles is up to, including conventions, appearances, new projects, crowd funding campaigns, etc.
Charles promises to keep emails to the bare minimum, so don't sign up if you want daily reminders to buy stuff and send money and things. This isn't that type of newsletter, Turkey.
BTW, everyone who subscribes gets a FREE digital Lilith Dark comic!