1. Dedicated email account (I use gmail) https://accounts.google.com/
Open a brand new free email account first. This account should be used only for your posting to your craig account. At times it will also be needed to verify you are a human when posting ads. Craig will send all notifications of new postings and deletions from flaggers to this email. Your ads will also draw a lot of spam to your email (phishing) and this can be easily managed with a dedicated email.
NEVER RESPOND TO ANY OF THE SPAMMERS... DELETE THEM! (you can read them if you like, most are stupid)
You are relying on your interested visitors clicking your image or text link and going to your offer they shouldn't be emailing you.
I like to have matching login IDs for my email and craig account. I make sure to use an ID that no one else would think of so it will be available when I open my craig account.
DO NOT USE YOUR REAL NAME! (duh)
You will need a separate email for each craig account if you decide to have more than one.