Send as permission disappears from Exchange 2007

Recently I have discovered that we kept losing the “Send as permission” on an Exchange 2007 SP1 with rollup 7. The funny thing was that it was because the user was a member of a group which was a member of print operators. And I do not know why all of a sudden this should conflict but it did. If I removed the user from print operators and changed the users admincount to 0 the problem was solved.