Forward all emails in mailbox with folders

.fetchmailrc

# ~/.fetchmailrc

poll mail.privateemail.com
  with proto IMAP
  uidl
  user "user@example.com"
  there with pass "password"
  mda "msmtp -a user@example.com -- destination@example.com"
  folders "INBOX", "INBOX/Folder 1", , "INBOX/Folder 2"
  ssl
  keep

.msmtprc

defaults
tls           on
logfile       ~/.msmtp.log

account       user@example.com
host          mail.example.com
port          587
protocol      smtp
auth          on
from          user@example.com
user          user@example.com
tls           on
tls_starttls  on

account default : user@example.com

# Add a new password to your keychain for smtp://mail.example.com with username user@example.com

run

# Fetchmail will go through all unseen emails in the specified folders of user@example.com
# and forward them to destination@example.com. You can use the python script to mark all
# emails in a folder as unread. Fetchmail will mark them as read as they are forwarded.

fetchmail

unsee_emails_in_folder.py

from imap_tools import MailBox, MailMessageFlags, A

with MailBox('mail.example.com').login('user@example.com', 'password', 'INBOX/Folder name') as mailbox:
    mailbox.flag(mailbox.uids(A(seen=True)), MailMessageFlags.SEEN, False)