Removing amavisd-new, spamassassin, clamav

[MrM]

Hi,

I have recently installed ISPConfig 3.0.1.3, following the Perfect Server Guide. When done, I noticed that more than half the RAM was being used, with no load on the server at all (it only has 512M of RAM in total). After a closer inspection I found that most of the memory was used by clamav and amavisd-new.

Since most of the e-mail needs will be offloaded to Google Apps for this server, I would like to disable/remove these services. What is the easiest way to do this?

I tried running aptitude purge amavisd-new spamassassin clamav clamav-daemon clamav-docs, but I don't like the look of this:

The following packages will be REMOVED:
  amavisd-new{p} clamav{p} clamav-base{u} clamav-daemon{p} 
  clamav-docs{p} clamav-freshclam{u} libarchive-zip-perl{u} 
  libberkeleydb-perl{u} libclamav6{u} libconvert-binhex-perl{u} 
  libconvert-tnef-perl{u} libconvert-uulib-perl{u} 
  libcrypt-openssl-bignum-perl{u} libcrypt-openssl-rsa-perl{u} 
  liberror-perl{u} libio-socket-inet6-perl{u} libio-stringy-perl{u} 
  libmail-dkim-perl{u} libmail-spf-perl{u} libmime-tools-perl{u} 
  libnetaddr-ip-perl{u} libsocket6-perl{u} 
  libsys-hostname-long-perl{u} libsys-syslog-perl{u} libtommath0{u} 
  libunix-syslog-perl{u} logrotate{u} pax{u} re2c{u} spamassassin{p} 
  spamc{u} 
0 packages upgraded, 0 newly installed, 31 to remove and 0 not upgraded.

It seems like a lot of packages will be removed if I do this. Particularly, why will logrotate be removed?

Is it safe to remove all these packages? Is there a better way of disabling these services? I would much rather just disable them and not completely remove them from the system.