javamail: Setting custom flags on imap mail and searching for mails with custom flags

Question

Is it possible to set custom flags on IMAP mail messages using java mail without overwriting existing flags? Eg, I need to set a flag \"processed\" on processed messages wit

Answer 1

Flags processedFlag = new Flags("processed");
folder.setFlags(msgs, processedFlag, true);
// or
msg.setFlags(processedFlag, true);

Not all IMAP servers will support these "user flags", but most will. To find messages without this flag:

Message[] msgs = folder.search(new FlagTerm(processedFlag, false));