On Mon 05 Feb 2018 at 18:06:34 (+0000), Brian wrote: > On Mon 05 Feb 2018 at 12:53:36 -0500, Greg Wooledge wrote: > > > On Mon, Feb 05, 2018 at 05:31:29PM +0000, Brian wrote: > > > AfAIK. there isn't any way to determine whether a message posted to > > > -user is from a non-subscriber. > > > > I believe some people are using the one of the X-Spam* headers > > and looking for the LDOSUBSCRIBER substring. Which is extremely > > non-obvious, and probably not a vector that ordinary users can > > easily pursue. > > The presence of LDOSUBSCRIBER indicates the post is from a subscribed > member. It absence tells you nothing about whether the person (as > indicted by the From: header) is subscribed or not.
Agreed; I've never earned the privilege of that in my header. I've sometimes wondered whether that's the reason I occasionally fall foul of the spam filter, and have to re-post. Cheers, David.