On Wed, 28 May 2014, David Bremner <david@tethera.net> wrote: > I've tagged this as a wishlist bug / feature request for now, until > somebody has a chance to track down where exactly the issue is, and how > hard it would be to fix. My quick guess is that gmime stops header processing at that point, and all the headers we require are after that invalid header. Our old header parser was a bit more relaxed in that sense, and probably just skipped the header. If it were a real email and not spam, I'd be interested... this could be intentional to trick a spam filter. BR, Jani.