using imaplib.IMAP4_SSL in multiple processes

I want to reuse imaplib.IMAP4_SSL instance over many processes so I don’t have to login multiple times.
Here is some code:

import imaplib
from multiprocessing import Process

def fetch(mail_client):
    mail_client.uid('fetch', b'1', 'BODY[TEXT]')

def main():
    c = imaplib.IMAP4_SSL('imap.gmail.com')
    c.login(user='**', password='***')
    c.select('inbox')

    procs = [Process(target=fetch, args=(c,)) for _ in range(100)]
    for p in procs:
        p.start()

    for p in procs:
        p.join()

if __name__ == '__main__':
    main()

But I get the errors that are related to socket:

imaplib.IMAP4.abort: socket error: [Errno 32] Broken pipe

I thought that this is because processes is writing to the same socket, that imaplib.IMAP4_SSL has, so i tried to add multiprocessing.Lock to prevent simultaneous access:

import imaplib
from multiprocessing import Process, Lock


def fetch(mail_client, lock):
    with lock:
        mail_client.uid('fetch', b'1', 'BODY[TEXT]')


def main():
    c = imaplib.IMAP4_SSL('imap.gmail.com')
    c.login(user='[email protected]', password='Qwe=1dSAzxc+%')
    c.select('inbox')
    lock = Lock()

    procs = [Process(target=fetch, args=(c, lock)) for _ in range(100)]
    for p in procs:
        p.start()

    for p in procs:
        p.join()


if __name__ == '__main__':
    main()

But the error persists.
Some further investigation has shown that the first process calls mail.uid successfully, but second process gets imaplib.IMAP4.abort: command: UID => socket error: EOF anyway.

I am using Ubuntu 16.04.
Any suggestions are highly appreciated.

Update: found another exception in stacktrace, maybe it causes all other exceptions:

ssl.SSLError: [SSL: DECRYPTION_FAILED_OR_BAD_RECORD_MAC] decryption failed or bad record mac (_ssl.c:2217)`

Seems like this issue is related
Python ssl problem with multiprocessing