push local mailbox mail to zulip

zulip_push_email.py

#!/usr/bin/env python
import zulip
import mailbox

client = zulip.Client(email="[email protected]",
                      api_key="111222aaabbb",
                      site="https://zulip.server.tld/api/")

mailbox_loc = '/var/mail/user'

inbox = mailbox.mbox(mailbox_loc)

for key in inbox.iterkeys():
    try:
        message = inbox[key]
    except:
        continue
    
    content = ""
    content += "To: {}".format(message['to'])
    content += "\nFrom: {}".format(message['from'])
    content += "\nSubject: {}".format(message['subject'])
    if message.is_multipart():
        for payload in message.get_payload():
            content += "\nBody: {}".format(payload.get_payload())
    else:
        content += "\nBody: {}".format(message.get_payload())
    
    # Send a stream message
    client.send_message({
        "type": "stream",
        "to": "channel",
        "subject": "email",
        "content": content
    })
    
    # Remove original message
    inbox.lock()
    inbox.discard(key)
    inbox.flush()
    inbox.unlock()