我正在分享一个链接,您可以通过该链接在 GAE 中配置电子邮件服务。
https://developers.google.com/appengine/docs/java/mail/usingjavamail
您需要在构建路径中配置 javax.mail jar 来配置它。
并确保您使用您的管理员电子邮件发送电子邮件,您正在使用这些电子邮件部署您的应用程序。这只会在服务器上部署一次。
  发送电子邮件的代码
   import java.io.UnsupportedEncodingException;
   import java.util.Properties;
   import javax.mail.Message;
   import javax.mail.MessagingException;
   import javax.mail.Session;
   import javax.mail.Transport;
   import javax.mail.internet.AddressException;
   import javax.mail.internet.InternetAddress;
   import javax.mail.internet.MimeMessage;
   public class SendMail {  
     public void sendMail(String sendEmailFrom,String sendMailTo,String recipientName,String messageSubject,String messageText){
    Properties prop = new Properties();
    Session session = Session.getDefaultInstance(prop,null);
    try{    
        Message msg = new MimeMessage(session);
        msg.setFrom(new InternetAddress(sendEmailFrom));
        msg.addRecipient(Message.RecipientType.TO, new InternetAddress(sendMailTo, "Mr./Ms. "+recipientName));
        msg.setSubject(messageSubject);
        msg.setText(messageText);
        Transport.send(msg);
        System.out.println("Successfull Delivery.");
    } catch (AddressException e) {
        e.printStackTrace();
    } catch (MessagingException e) {
        e.printStackTrace();
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    }
}