Modify Email on IMAP Server?

Question:
Is it possible to change the Subject of an IMAP email?

Answer:

The IMAP protocol is such that emails (on the server) cannot be changed. This is not a Chilkat limitation, but it is the way IMAP works. In other words, if you want to change an email,
you can download it, make changes, then “append” the new email to the mailbox by calling one of the “Append*” methods, and then delete the old email. The new email will have a different UID.

Note: It is possible to modify the flags of an email (seen/unseen, flagged, answered, draft, deleted…)