Question

I got a requirement which I don’t know how to get started.

Requirement:

The application will send emails to clients (using org.springframework.mail.javamail.JavaMailSender) with same “from email address” as [e-mail]. Also the email content will have some hidden information such as client_id. If the client reply back to that email, I need to get that as an HttpServletRequest to a Servlet so that I can process it.

EDIT:
This web application does not have google app engine setup, but my requirement is matching similar to this link.

Answer 1

When someone replies to the mail you sent him that mail will go to the POP3 server configured for your domain. From this SMTP server you can read this mail using the Java Mail API. You can have a Spring timer task to keep polling this mailbox after every few seconds.

I would look at the below resources to see how to read mail from the POP3 server –

Using JavaMail API –

http://metoojava.wordpress.com/2010/03/21/java-code-to-receive-mail-using-javamailapi

Using Spring –

http://blog.solidcraft.eu/2011/04/read-emails-from-imap-with-spring.html