Differences in "Delivered-To" header between deliver and LMTP

[Jeff Rice]

Hi,
I'm transitioning my server over from using the deliver LDA and LMTP.  
Suddenly a bunch of sieve filters stopped working, and I noticed the 
contents of the Delivered-To header are different.

Using Dovecot's deliver LDA, the contents are a bare email address 
(foo at bar.com).  Using Dovecot LMTP, they are in brackets 
(<foo at bar.com>).  Is there a reason why this isn't consistent between 
the two delivery agents?  It seems like it ought to be.

Jeff