I have resolved my problem with comcast.net and other hosts. It was NOT the underscore issue. It was (you guessed it) my SPF record. The _correct_ SPF entry for AppEngine apps that use a custom domain and send mail is;
v=spf1 include:aspmx.googlemail.com ~all There are a number of discussions in this group that point to a Google Apps Admin Help page that shows SPF entry that looks like this: v=spf1 include:_spf.google.com ~all That is NOT a correct entry. When I removed that entry and added the one above, the issue resolved itself. If found the correct entry by examining tweetdeck.com's DNS records. The are heavy users on AppEngine's mail service, so I figured that they would have it right, and they did. Thank you tweetdeck. The underscore issue is still a real issue, but is was not my issue. On Apr 19, 11:05 am, "emur...@conceptuamath.com" <emur...@conceptuamath.com> wrote: > I've added a separate issue for the fact that the reply-address has an > illegal character that causes some email host to reject the email. it > issue number 3114. Please Star this issue and add a comment so it > get's attention. > > Ed > > On Apr 19, 9:12 am, Jody Belka <j...@jj79.org> 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 <stefan.urban...@web.de> 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. > > > > -- > > > You received this message because you are subscribed to the Google Groups > > > "Google App Engine" group. > > > To post to this group, send email to google-appeng...@googlegroups.com. > > > To unsubscribe from this group, send email to > > > google-appengine+unsubscr...@googlegroups.com<google-appengine%2Bunsubscrib > > > e...@googlegroups.com> > > > . > > > For more options, visit this group at > > >http://groups.google.com/group/google-appengine?hl=en. > > > -- > > You received this message because you are subscribed to the Google Groups > > "Google App Engine" group. > > To post to this group, send email to google-appeng...@googlegroups.com. > > To unsubscribe from this group, send email to > > google-appengine+unsubscr...@googlegroups.com. > > For more options, visit this group > > athttp://groups.google.com/group/google-appengine?hl=en. > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine" group. > To post to this group, send email to google-appeng...@googlegroups.com. > To unsubscribe from this group, send email to > google-appengine+unsubscr...@googlegroups.com. > For more options, visit this group > athttp://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
