[Dovecot] Search for substring in header?

[Dave Abrahams]

Hi,

According to the IMAP spec (http://tools.ietf.org/html/rfc2060#page-37),
if I do a search for "TO isocpp.org" it should find all the messages
whose To: field contains the string "isocpp.org", but dovecot is
returning me an empty list.  However, a search for "TO tm at isocpp.org"
produces a long list of messages.  What am I doing wrong?

TIA,
Dave

-- 
Dave Abrahams
BoostPro Computing                  Software Development        Training
http://www.boostpro.com             Clang/LLVM/EDG Compilers  C++  Boost