Yes, I think that is my issue.  Here is the return header from an
email that was successfully received by yahoo:

Return-Path: <34vdlsw0jb-ooazoqbfgmymftsymux.oayqygdygdkmtaa....@1rf-
h_fbpz96xcrx.apphosting.bounces.google.com>

note: @1rf-h_fbpz96xcrx.

The underscore is illegal.  I think that is why many hosts are
rejecting my emails.  The receiver is never notified in any way.

On Apr 19, 9:12 am, Jody Belka <[email protected]> wrote:
> There is indeed a serious. Google is including an _ as part of a dns
> label in (I assume) the return path. An _ is not valid as part of a
> dns label. The only valid things are letters, numbers, and a dash (-).
> This is something that Google should urgently fix, as any servers that
> check the return path for validity will reject mail.
>
> On 19 April 2010 15:38, Mabuse <[email protected]> wrote:
>
>
>
>
>
> > Hello,
> > I've the same issue. The german mail provider web.de rejects all mails
> > from the app engine.
> > It seems there is a syntax error in the mail header. See:
> >http://code.google.com/p/googleappengine/issues/detail?id=1800#c15
> > It's an blocker for serious apps with GAE.
>
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