Download / Upload eml files from Gmail IMAP

imap_gmail.py

import sys
import imaplib
import email

ACCOUNT = ""
PASSWORD = ""

INBOX = "INBOX"
TRASH = "[Gmail]/Trash"
FILE = "modify.eml"

def main(argv):
    M = imaplib.IMAP4_SSL('imap.gmail.com')
    M.debug = 4

    try:
        rv, data = M.login(ACCOUNT, PASSWORD)
    except imaplib.IMAP4.error as e:
        print("LOGIN FAILED")
        sys.exit(1)

    rv, data = M.select(INBOX)
    if rv == 'OK':        

        if argv[1] == "upload":
            print("UPLOAD EMAIL")
            f = open(FILE, "r")
            msg = email.message_from_file(f)
            f.close()
            M.append("INBOX", "(\\Seen)",  None, msg.as_bytes())

        if argv[1] == "download":
            print("DOWNLOAD EMAIL")
            rv, data = M.search(None, "ALL")

            if rv != 'OK':
                print("No messages found!")
                return

            for num in data[0].split():
                rv, data = M.fetch(num, '(RFC822)')
                f = open(FILE, "wb") 
                f.write(data[0][1])
                f.close()

        M.close()
    else:
        print("ERROR: Unable to open mailbox ", rv)

    M.logout()

if __name__ == "__main__":
    main(sys.argv)