Is there any Key or name field (in Message.Header or else) SAME or RELATE for both received and sent mail?

Question

Is there any Key or name field (in Message.Header or else) SAME or RELATE for both received and sent mail .

For example, MessageId is unique key for each message. But I want something else (Key). I had not found any field in Message.Header(Message or MimeMessage or with also MimeMessageHelper)

I am using Java.Mail and I want to group each received and reply mail with a key. Anybody help me, Please ?

Answer 1

In a word.

No.

There is nothing in the headers to tie one email to another. The closest you can do, is compare subjects + the Date.