On Fri, Apr 17, 2020 at 10:52:37AM -0700, Greg A. Woods wrote: > At Thu, 16 Apr 2020 09:14:30 +0200, ignat...@cs.uni-bonn.de wrote: > Subject: Re: SMTP servers receiving from gmail > > > > On Wed, Apr 15, 2020 at 10:55:25PM +0200, Rhialto wrote: > > [Google "Mail"] > > > > > They demand DKIM or similar configurations, which I refuse to use, > > > because its a lot of work to configure, and it often doesn't even work > > > with mail forwarding. > > > > It might help to have a PTR record for the smtp clients' outgoing address; > > I doubt they demand either.
I looked at their cryptic web pages referenced in the error, and links therein, and it seemed to me that they do. They probably do a statistics per address range dance on top of it. (All from memory.) -is