IMAPv4 Protocol

Can you input some custom header/custom data in开发者_StackOverflow imap4 protocol. Thanks.

Yes, IMAP4rev1 is extensible. There are already numerous extensions for this protocol and as long as your server implementation and your clients support a specific extension, there shouldn't be any problem.

You might also want to browse the Unofficial IMAP Protocol Wiki.

You would need to modify both the server to insert the headers and the client to interpret them. This is probably a bad idea. You probably want to add custom headers to the email messages that are served via imap.