I receive an email sent also to other people in Cc. If I reply to it with
gnus-summary-followup, Gnus includes me in the Cc list. How can I avoid that?
The behaviour you want is the default if you've told emacs your email address
user-mail-address. Another option is to set
message-dont-reply-to-names is a variable defined in `message.el'. Its value is nil You can customize this variable. This variable was introduced, or its default value was changed, in version 24.3 of Emacs. Documentation: Addresses to prune when doing wide replies. This can be a regexp, a list of regexps or a predicate function. Also, a value of nil means exclude `user-mail-address' only. If a function email is passed as the argument.
See Wide-Reply for more details (or
(info "(message)Wide Reply"))