App engine is not sending emails

my application deployed on app engine has been working succesfully half a year. One function is a sending of emails. But today it started to fail everytime with this error: javax.mail.SendFailedException:开发者_开发问答 Send failure (javax.mail.MessagingException: Illegal Arguments (java.lang.IllegalArgumentException: Unauthorized Sender: Unauthorized sender)) Of course sender email is registered in app engine console.

I didn't change anything!

Anyone who share same issue?

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If someone have the same problem, the reason is the sender for the mail is incorrect or doesn't have permissions to send the email, I use the default noreply@your-application-id.appspot.com account to send the email.

InternetAddress from = new InternetAddress(
                    String.format("noreply@%s.appspotmail.com", SystemProperty.applicationId.get()),
                    "Your Application Name") ;
message.setFrom(from);

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You can check if the account of your user is not marked as a spammer or disabled in Google Apps.

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If you are sending a very large number of emails to a single email account, Google can throttle you. When we were sending emails whenever we got an error, we ran into a similar problem.

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Also, there is a limit on number of calls to mail API per minute.

Maybe earlier you were sending mail to fewer people resulting in fewer calls to the mail api.

It's 8 calls per minute, unless you have provided a credit card number to enable your billing.

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Does your sender email address has permission to access this app engine application ?

it's must have permission to access your application then it will work...