Develop Reference

Retrive a mail from gmail inbox for a particular subject

I have a scenario where I have to read a mail sent out by a X person with a specific subject, which i will be receiving on a daily basis.
Is there any JAVA Gmail APi provided by google to retrieve the recent mail that i have received.
And also is there a way to retrieve the mail for a given date?

Yes there's a Gmail API and it has a Java client library, you can check the Quickstart to get used to it.
Now, for retrieving a list of mails you will need to use the Users.messages: list endpoint ( There's also a Java example on how to use that endpoint). Answering your question about retrieving certain emails, you will need to use the q parameter and set the values there as if you would be searching an email in the gmail search bar. I will leave you an example that you can try using the Try this API:
List emails from certain user and date.
Notice
You will only get the email's IDs, for getting more info about an email, you will have to use the Users.messages: get endpoint.

Using Gmail aliases to link mail replies to application content

I have the following use case in my app:
When a specific event happens in the app all interested users should be notified by email. Then if a user replies to the email, his reply should be shown in the event page in the app.
My initial idea was to create a temp mail alias of the main notification email every time when an event happens and send the notification email with that alias set in the Reply-To header. Then if someone replies to that mail by using the alias (let's say csa123423#mydomain.com) I can figure out which event this reply refers to.
It turned out that Spring's JavaMailSender doesn't provide a way to use aliases, so I tried with Gmail API. As far as I understood creating a Gmail alias means actually setting an already existing email in your domain as an alias for another already existing email in that domain. So the Java code to achieve this using Directory API and Gmail API would look like this:
User newUser = new User();
UserName userName = new UserName();
userName.setGivenName("xsd");
userName.setFamilyName("ewrewr");
newUser.setPrimaryEmail("bbb34262bb45#mydomain.com");
newUser.setPassword("12345");
newUser.setName(userName);
User result = directoryService.users().insert(newUser).execute();
SendAs sendAs = new SendAs().setSendAsEmail("bbb34262bb45#mydomain.com").setReplyToAddress("bbb34262bb45#mydomain.com").setDisplayName("My name").setTreatAsAlias(true);
SendAs sendAsResult = gmailService.users().settings().sendAs().create(user, sendAs).execute();
MimeMessage emailContent = createEmail("mymail#gmail.com", "bbb34262bb45#mydomain.com", "Test from app", "Test body");
Message message = createMessageWithEmail(emailContent);
message = gmailService.users().messages().send(user, message).execute();
But as far as I know there are some limits on the number of accounts you can create per domain/account and also Google would charge more for this.
Is there another easier way to create aliases in Gmail? Or is there another approach to achieve the desired functionality (linking mail replies to application content) without using mail aliases?

Try leveraging '+' functionality given by Gmail for creating temporary aliases.
The basic idea is if my email id is xyz#gmail.com, I can send/receive an email with xyz+1#gmail.com or xyz+anything_here#gmail.com and it will work like a charm.
You can utilize this by keeping the alias/unique-id after the '+' in the Gmail id and then parse this alias easily in your application.

gmail smtp exception in java play framework

I was reading about what is the best way about sending email through play framework (java). I have found this: https://github.com/playframework/play-mailer and I followed the instructions. I use gmail.
Here is what I added into application.conf:
play.mailer.host="smtp.gmail.com"
play.mailer.port=587
play.mailer.ssl=yes
play.mailer.tls=no
play.mailer.user="blabla#gmail.com"
play.mailer.password="blabla"
and here is my controller:
Email email = new Email();
email.setSubject("Confirmation");
email.setFrom("Mister FROM <test#gmail.com>");
email.addTo("Miss TO <test2#gmail.com>");
email.setBodyText("A text message");
email.setBodyHtml("<html><body><p>An <b>html</b> message</p></body></html>");
mailerClient.send(email);
Everything compiles with no problems, but when I run it I get this exception:
[EmailException: Sending the email to the following server failed : smtp.gmail.com:587] at mailerClient.send(email);

You have to change the change the gmail configuration also .
like-
Go to your gmail account then in setting section go to the "Forwarding and POP/IMAP" tab then enable "Enable IMAP".
Hope this will help if you are sending the correct credential.

unable to send mails to outlook 2007 using on behalf of

Our application uses javax.mail.MimeMessage, we are written this code
Message msg = new MimeMessage(mailSession);
msg.setFrom(new InternetAddress("mail#xyz.com", "XYZ"));
From section changing work in gmail and yahoo but not working outlook,
can any tell reason for this.

You need to add msg.setSender(new InternetAddress(...));

java mail - getting message by message ID

I'm developing Android mail client. I need to build a "conversation" structure for every email message. I use the
IMAPMessage.getInReplyTo()
method that returns the Message ID of message which the message is a reply to. Unfortunatelly there seems to be no easy way to obtain message from
IMAPFolder
using its message ID. It is only possible to get the message by its UID. Is there an easy way to get the IMAP message by its Message ID?

You can use the IMAPFolder's search method like this:
SearchTerm searchTerm = new MessageIDTerm(messageId);
Message[] messages = imapFolder.search(searchTerm);
See the docs for the IMAPFolder's search method here:
https://javaee.github.io/javamail/docs/api/com/sun/mail/imap/IMAPFolder.html#search-javax.mail.search.SearchTerm-
and for the MessageIDTerm class here:
https://javaee.github.io/javamail/docs/api/javax/mail/search/MessageIDTerm.html

unfortunately there is no straight forward solution... May be what you can try is to maintain an internal structure with body structures of all the mail ids and then perform a one on one Message-ID check and obtain the UID of mail. Anyways you would be doing it, in order to show the Maillist. Add a new logic to map the message-ids as well.