How do you mark a message as read?

Tom Copeland

First of all, you can't mark a message as read if you are using a POP3 server - the POP3 protocol doesn't support that. However, the IMAP v4 protocol does.

You might think the way to do this is to get the message, set the Flags.Flag.SEEN flag to true, and then call message.saveChanges(). Oddly, this is not the case.

Instead, the JavaMail API Design Specification, Chapter 4, section "The Flags Class" states that the SEEN flag is implicitly set when the contents of a message are retrieved. So, to mark a message as read, you can use the following code: