avoid using header_raw for Message-ID retrieval

This is for consistency with ssoma.  I doubt it makes
a difference in practice, but in case somebody decides
any of the Message-ID-containing headers should have
strange characters, we'll decode and attempt to thread
them.  This isn't an attack vector, just a way to
make messages thread improperly which is pointless...

0 files changed, 0 insertions, 0 deletions