That's maybe a fix, but why is this happening? In my admittedly short
experiments with Mail::Header I've always got the header lines back
exactly as they were before, unless I asked it to fold them. RFC2821 (as
you know) states that a relay must not modify existing Received: lines in
any way. All header lines in a message seem to be unfolded onto one line
currently, so isn't this going to kinda fix the problem, but make some
modification to existing Received: lines and thus violate RFC2821?
Actually looking at it more thoroughly I have no idea why this is happening and this patch will actually munge headers where no munging should be occurring.
Is there any chance your Mail::Header module is out of date or broken?
Matt.
