<A href="http://notesbusters.com/2011/11/09/lotus-notes-8-5-2-code-error-the-tale-of-regression/" target="_blank">Victor Toal is happy to report he found this regression bug during testing</A> and an SPR has been opened. The problem exists in Domino 8.5.2, even with FP1, but is fixed in 8.5.3. He just wants to warn you not to name any fields "eml".