Sorry, new here and accidently posted these questions as a reply to other subject before making new thread. Curious about following two topics and wondering if anyone could help with answers. I appreciate any replies. Thank you.

If someone sends you an email (a normal email not one with any virus), when you open it can they see your ip address from where you are opening it?
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If you use an proxy service to log into yahoo or aol to check your email, does the proxy site have access to your email account since you went thru them (username,password, read emails,ect..)

Also is there a way to block your ip address when on yahoo mess. with someone else
Thanks again fro help!!