There have been several people reporting this same error:
http://code.google.com/p/googleappengine/issues/detail?id=5575
Robert
On Mon, Aug 15, 2011 at 21:55, Yusuke Takase <[email protected]> wrote:
> Hello,
> I'm experiencing sending mail trouble at AppEngine Java.
>
> I could send mail with MailService and JavaMail on AppEngine, without
> any problems.
> Since 2011/08/13, I cannot send any mail with same code and sender.
> Sender address is application Administrator's address(gmail).
>
> Error messages is below...
>
> Send failure (javax.mail.MessagingException: Illegal Arguments
> (java.lang.IllegalArgumentException: Unauthorized Sender: Unauthorized
> sender))
>
> Are there any changes in MailService specifications?
>
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