how delete a message

I download libetpan-0.42 and compile without errors.
View test sample fetch-attachment, how i can delete message affter i
sucessful get all attachment from message? (-d pop3)
I read API and understand that i must before mailmessage_free(msg):
 - sets flag that message is deleted (don't now how)
 - call mailsession_expunge_folder(folder->fld_session)  to delete all marked.
mailmessage_get_flags(msg, &flags); // Only get's flags but how mailmessage_set_flags?


Sorry for my english.




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