On Fri, 2010-10-08 at 10:37 +0200, Jort Koopmans wrote: > Bug 1486418 seems related to > php 5.2.3, so not likely to be the cause. mail.add_x_header is not > implemented in this version. Typo; Bug 1486418 seems related to php 5.3.0, so not likely to be the cause.