efaq: Automatically starting a mail or news reader
11.7 How do I make Emacs automatically start my mail/news reader?
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To start Emacs in Gnus:
emacs -f gnus
in Rmail:
emacs -f rmail
A more convenient way to start with Gnus:
alias gnus 'emacs -f gnus'
gnus
It is probably unwise to automatically start your mail or news reader
from your ‘.emacs’ file. This would cause problems if you needed to run
two copies of Emacs at the same time. Also, this would make it
difficult for you to start Emacs quickly when you needed to.