How to disable amavis and clamav

Edit: /etc/postfix/main.cf

#content_filter = amavis:[127.0.0.1]:10024
#receive_override_options = no_address_mappings

Edit: /etc/postfix/master.cf

#amavis unix - - - - 2 smtp
# -o smtp_data_done_timeout=1200
# -o smtp_send_xforward_command=yes

#127.0.0.1:10025 inet n - - - - smtpd
# -o content_filter=
# -o local_recipient_maps=
# -o relay_recipient_maps=
# -o smtpd_restriction_classes=
# -o smtpd_client_restrictions=
# -o smtpd_helo_restrictions=
# -o smtpd_sender_restrictions=
# -o smtpd_recipient_restrictions=permit_mynetworks,rej ect
# -o mynetworks=127.0.0.0/8
# -o strict_rfc821_envelopes=yes
# -o receive_override_options=no_unknown_recipient_chec ks,no_header_body_checks
# -o smtpd_bind_address=127.0.0.1

Now stop amavis-new and clamd:

$ sudo /etc/init.d/amavis stop
$ sudo /etc/init.d/clamav-daemon stop
$ sudo /etc/init.d/clamav-freshclam stop

Now disable amavis and clamd form starting on system boot:
chkconfig doesn't work for Ubuntu so use this boot process editor:

$ sudo apt-get update
$ sudo apt-get install sysv-rc-conf (install it)
$ sudo sysv-rc-conf (run it)

Remove the X's from the processes you don't want to start at boot.

Restart postfix:

/etc/init.d/postfix restart

And you have working postfix without Amavis and Clamd.

References:
http://www.howtoforge.com/forums/showthread.php?t=39590
http://ubuntuforums.org/showthread.php?t=89491