This is basically the right thing to be doing here.  The accuracy range info is effectively meaningless for POP3 because we have no meta-data for messages to update and our sync is not actually time-aware.  Really all POP3 wants out of of this is for:
- syncedToDawnOfTime() to return false while "this.hasOverflowMessages()" is true.  And you've done that here
- To avoid refresh-style synchronizations while scrolling the list.  IMAP does those to refresh meta-data, but it's absolutely not needed for POP3.  By setting the range nearly maximally, you're accomplishing this.

Really, what we want to do is move more of this date range logic into the ImapFolderSyncer class or some other support class.