gnus-gcc-self-resent-messages

gnus-gcc-self-resent-messages is a variable defined in `gnus-msg.el'.
Its value is

no-gcc-self

Documentation:
Like `gcc-self' group parameter, only for unmodified resent messages.
Applied to messages sent by `gnus-summary-resend-message'. Non-nil
value of this variable takes precedence over any existing Gcc header.

If this is `none', no Gcc copy will be made. If this is t, messages
resent will be Gcc'd to the current group. If this is a string, it
specifies a group to which resent messages will be Gcc'd. If this is
nil, Gcc will be done according to existing Gcc header(s), if any.
If this is `no-gcc-self', resent messages will be Gcc'd to groups that
existing Gcc header specifies, except for the current group.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.3 of Emacs.