You can't disable an individual mailbox from automatically synchronising when using Nokia Messaging. If you disable one email synchronising (for example Hotmail) all others will be disable too. 

Perform the following steps to disable email synchronizing from all email accounts (for example on Nokia E72 phone):

  1. Start the Email application.
  2. Select Settings.
  3. Select the one mailbox.
  4. Select Account settings.
  5. Select What to synchronise.
  6. Select Synchronise email.
  7. Select Off.
  8. Press OK.