Completely disable mailing service

[alleks]

I just setup my mailing service with Google Business free edition, because it's just want I need at Google and I can save some memory for apache performance by disabling my mailing service on my server (for now)

So my question is, what do you recommend to do to disable the mailing service but not deleting the existing data?

The only thing I would need to keep tuning, is Postfix to send mails from website forms. I just `update-rc.d -f amavis remove` and now going to remove Courier and fix the problems with Postfix's dependency with amavis, anything else?

Oh, I also disable Mail Server Service at my ISPConfig panel and reconfigured it.