Here is a list of all files with brief descriptions:

__IMAP_APPEND.h
__IMAP_AUTHENTICATE.h
__IMAP_CHECK.h
__IMAP_CLOSE.h
__IMAP_COPY.h
__IMAP_CREATE.h
__IMAP_DELETE.h
__IMAP_EXAMINE.h
__IMAP_EXPUNGE.h
__IMAP_FETCH.h
__IMAP_LIST.h
__IMAP_LOGIN.h
__IMAP_LSUB.h
__IMAP_RENAME.h
__IMAP_SEARCH.h
__IMAP_SELECT.h
__IMAP_STARTTLS.h
__IMAP_STATUS.h
__IMAP_STORE.h
__IMAP_SUBSCRIBE.h
__IMAP_UID.h
__IMAP_UNSUBSCRIBE.h
__POP3_DELE.h
__POP3_LAST.h
__POP3_LIST.h
__POP3_NOOP.h
__POP3_PASS.h
__POP3_QUIT.h
__POP3_RETR.h
__POP3_RPOP.h
__POP3_RSET.h
__POP3_STAT.h
__POP3_TOP.h
__POP3_USER.h
__SMTP_AUTH.h
__SMTP_DATA.h
__SMTP_EHLO.h
__SMTP_EXPN.h
__SMTP_HELO.h
__SMTP_HELP.h
__SMTP_MAIL.h
__SMTP_NOOP.h
__SMTP_QUIT.h
__SMTP_RCPT.h
__SMTP_RSET.h
__SMTP_VRFY.h
IMAPCommand.h
IMAPService.h
IMAPSession.h
MailDelivery.cpp
MailDelivery.h
MailFileSystem.h
main.cpp
POP3Command.h
POP3Service.h
POP3Session.h
SMTPCommand.h
SMTPService.h
SMTPSession.h