Stuart is the winner, I think.  It will require a modification of the list
server configuration.  See:

http://stackoverflow.com/questions/14155604/avoid-gmails-this-message-may-not-have-been-sent-by-using-sender-header

Here are the headers of the email

>
> Date: Thu, 1 Sep 2016 17:23:37 -0700
> Reply-To: Stuart MacMillan <stuartmacm@GMAIL.COM>
> Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
> From: Stuart MacMillan <stuartmacm@GMAIL.COM>
> Subject: Re: removing gmail warning from vanagon messages?

It might work (according to that stackoverflow answer) for Gerry to set the
"from" header to something like "no-reply@gerry.vanagon.com".  It already
sets the reply-to header correctly, so when you hit "reply" it will still
go to Stuart.

Gmail owns both ends of the transaction--they know that Stuart didn't
actually send that email--gerry.vanagon.com sent it.  So it sees a "From: "
header in an email from gerry.vanagon.com, but it says From:
someone@gmail.com and says HEY WAIT A SEC *I'M* GMAIL! I WOULD KNOW IF I
SENT THAT--AND I DIDN'T!--SOMEONE MIGHT BE SCAMMING! ... I'd better warn my
users.

mike

On Fri, Sep 2, 2016 at 10:33 AM, Stuart MacMillan <stuartmacm@gmail.com>
wrote:

> That happens to me too--missing original posts. Has to be a Gerry problem,
> not our email programs.  That’s why I’m not a fan of trimming posts, some
> of these orphans make no sense, but if the thread appears you can sort it
> out.
>
>
>
> Stuart
>
>
>
> From: David McNeely [mailto:davmcneely40@gmail.com]
> Sent: Thursday, September 01, 2016 6:46 PM
> To: Stuart MacMillan
> Cc: vanagon@GERRY.VANAGON.COM
> Subject: Re: removing gmail warning from vanagon messages?
>
>
>
> I get the message for all Vanagon list emails.  It seems that a relayed
> email will generate the message.  Since I know the drill, I don't worry
> about it.
>
> What does bother me is that I never get some messages, until someone has
> replied.  I get the reply, with the original if it was not removed by the
> person who replied.  Also, gmail sorts the messages for me, I guess based
> on content, into its default categories.  Some Vanagon list messages arrive
> in my inbox, some in the forums folder, some in the updates folder, and
> there doesn't seem to be a reason for the assignment that makes sense to me.
>
>
>
> On Thu, Sep 1, 2016 at 5:58 PM, Stuart MacMillan <stuartmacm@gmail.com>
> wrote:
>
> You should be able to add "Vanagon@gerry.vanagon.com" (see below) as a
> "safe sender" in your Gmail settings to eliminate this message.
>
> Stuart
>
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
> Of Steven Johnson
> Sent: Thursday, September 01, 2016 5:22 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Re: removing gmail warning from vanagon messages?
>
> No, I get it too.  Using gmail...
>
> Steven
> 91 Westy
>
> On Thu, Sep 1, 2016 at 7:52 PM, Karl Ploessl <karl.ploessl@gmail.com>
> wrote:
>
> > I see this "warning" all the time from different list member. Nothing
> > to worry about (I think).
> >
> > Karl
> >
> > On Thu, Sep 1, 2016 at 7:48 PM, Dragon List <dragon01list@gmail.com>
> > wrote:
> >
> > > i just started using gmail for my vanagon listserv messages.
> > >
> > > stuart's just came in with a warning "this message might not have
> > > been
> > sent
> > > by: stuart's gmail address.  Learn More  Report phishing
> > >
> > > now, clearly it's a fine email, but i'd like to rid myself of the
> > annoying
> > > message any time someone sending from a gmail account to gerry gets
> > > to my inbox.  has anyone successfully done this?  the "learn more"
> > > information doesn't have a listserv solution, that i can see.
> > >
> > > thanks.
> > > bill
> > > felton, ca
> > > 87 syncro westy
> > >
> >
>
>
>