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Sending mail functionality for Google App Engine

 4 years ago
source link: https://blog.knoldus.com/sending-mail-functionality-for-google-app-engine/
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Sending mail functionality for Google App Engine

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When we search for sending mail functionality then we get the solution using javax mail API.

Following is the code of using javax.mail API :

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​
String emailId = <recipient-email-id>;
Properties props = new Properties();
props.put("mail.smtp.host", "smtp.gmail.com");
props.put("mail.smtp.port", "587");
props.put("mail.debug", "true");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
​
Session s = Session.getInstance(props, null);
s.setDebug(true);
​
Message message = new MimeMessage(s);
​
InternetAddress from = new InternetAddress(,);
InternetAddress to = new InternetAddress(emailId);
​
message.setFrom(from);
message.addRecipient(Message.RecipientType.TO, to);
​
message.setSubject(<subject>);
message.setContent(<content>, "text/plain");
​
val tr = s.getTransport("smtp");
tr.connect("smtp.gmail.com", <email-id>, <password>);
message.saveChanges();
tr.sendMessage(message, message.getAllRecipients());
tr.close();

If you are using free app on Google App Engine then above code will not work and will get following error:

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com.google.apphosting.api.ApiProxy$FeatureNotEnabledException: The Socket API will be enabled for this application once billing has been enabled in the admin console.

In above code, we are trying to set smtp configuration. When we use smtp configuration then Google App Engine tries to use Socket API and these Socket APIs are available only with paid apps. If you will use above code with free app on Google App Engine then we will get above error.

So, to avoid this error, use following code :

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​
Properties props = new Properties();
Session session = Session.getDefaultInstance(props, null);
​
String msgBody = "...";
​
Message msg = new MimeMessage(session);
msg.setFrom(new InternetAddress(<sender-email>, "Sender name"));
msg.addRecipient(Message.RecipientType.TO,new InternetAddress(<recipient-email>, "recipient name"));
msg.setSubject("Your Example.com account has been activated");
msg.setText(msgBody);
Transport.send(msg);

There is one more possibility that you can get following error as well:

xxxxxxxxxx
javax.mail.SendFailedException: Send failure (javax.mail.MessagingException: Illegal Arguments (java.lang.IllegalArgumentException: Unauthorized Sender: Unauthorized sender))

This error comes when sender email address is not added in permission list in your app on Google App Engine. So sender email must be added in permission list.

If you want to get more on this then see here

Written by Rishi Khandelwal

Rishi is a Lead Consultant, with experience of more than 7 years. Rishi is product focused developer who loves developing both front-end user interfaces and scalable back-end infrastructure. He is a good team player, quick learner and a humble person. He has good time management skills, aimed to give best results and fully dedicated towards his work & responsibilities. He is able to work as individual and as well as in team. He loves to share his knowledge, therefore he often writes technical blogs.

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