vi ~/.muttrc

set realname=”Vitalijus Ryzakovas”
set from=”user@host”
set use_from=yes

Some more useful hints:
set edit_headers = yes
set use_envelope_from=yes’

vi ~/.mutt/p1
set pager_format=”(P1) %S [%C/%T] %n (%l) %s”
set realname=”Joe Doe”
set [email protected]
my_hdr Organization: P1’s Organization
my_hdr PGP: s
set pgp_sign_as=”keyid”
set signature=”~/.signature-p1″
color status black p1-color

mutt -F ~/.mutt/p1

Different back address:
set reverse_name
set [email protected]
alternates “[email protected]|[email protected]”