set from = "yourusername@gmail.com"
set realname = "Your Real Name"

set imap_user = "yourusername@gmail.com"
set imap_pass = "yourpassword"

$ mutt
Error in $HOME/.muttrc, line 12: imap_user: unknown variable
Error in $HOME/.muttrc, line 13: imap_pass: unknown variable
source: errors in $HOME/.muttrc
Press any key to continue...

$ mutt -v
Mutt 1.5.21 (2010-09-15)
Copyright (C) 1996-2009 Michael R. Elkins and others.
Mutt comes with ABSOLUTELY NO WARRANTY; for details type `mutt -vv'.
Mutt is free software, and you are welcome to redistribute it
under certain conditions; type `mutt -vv' for details.

System: Darwin 11.3.0 (x86_64)
ncurses: ncurses 5.9.20110404 (compiled with 5.9)
libiconv: 1.14
libidn: 1.22 (compiled with 1.22)
Compile options:
-DOMAIN
-DEBUG
-HOMESPOOL  +USE_SETGID  +USE_DOTLOCK  +DL_STANDALONE  +USE_FCNTL  -USE_FLOCK
+USE_POP  +USE_IMAP  -USE_SMTP
-USE_SSL_OPENSSL  -USE_SSL_GNUTLS  -USE_SASL  -USE_GSS  +HAVE_GETADDRINFO
+HAVE_REGCOMP  -USE_GNU_REGEX
+HAVE_COLOR  +HAVE_START_COLOR  +HAVE_TYPEAHEAD  +HAVE_BKGDSET
+HAVE_CURS_SET  +HAVE_META  +HAVE_RESIZETERM
+CRYPT_BACKEND_CLASSIC_PGP  +CRYPT_BACKEND_CLASSIC_SMIME  -CRYPT_BACKEND_GPGME
-EXACT_ADDRESS  -SUN_ATTACHMENT
+ENABLE_NLS  -LOCALES_HACK  +HAVE_WC_FUNCS  +HAVE_LANGINFO_CODESET  +HAVE_LANGINFO_YESEXPR
+HAVE_ICONV  -ICONV_NONTRANS  +HAVE_LIBIDN  +HAVE_GETSID  -USE_HCACHE
-ISPELL
SENDMAIL="/usr/sbin/sendmail"
MAILPATH="/var/mail"
PKGDATADIR="/opt/local/share/mutt"
SYSCONFDIR="/opt/local/etc"
EXECSHELL="/bin/sh"
-MIXMASTER
To contact the developers, please mail to <mutt-dev@mutt.org>.
To report a bug, please visit http://bugs.mutt.org/.

Connecting to gmail.com...

Error in $HOME/.muttrc line 9: trash: unknown variable
Error in $HOME/.muttrc, line 11: header_cache: unknown variable

set imap_user = "YOUR.EMAIL@gmail.com"
set imap_pass = "PASSWORD"
set folder = "imaps://imap.gmail.com:993"
set spoolfile = "+INBOX"

set smtp_url = "smtp://yourusername@smtp.gmail.com:587/"
set smtp_pass = "yourpassword"