https://www.offlineimap.org/

.offlineimaprc

[general]
accounts = Gmail
maxsyncaccounts = 3
socktimeout = 90

[Account Gmail]
localrepository = Gmail-Local
remoterepository = Gmail-Remote

[Repository Gmail-Local]
type = Maildir
localfolders = ~/Maildir/Gmail

[Repository Gmail-Remote]
type = IMAP
remotehost = imap.gmail.com
remoteuser = daniel.nouri@gmail.com
# remotepass = PASSWORD
ssl = yes
sslcacertfile = /etc/ssl/certs/ca-certificates.crt
maxconnections = 3
realdelete = no
folderfilter = lambda folder: folder not in ['[Gmail]/Spam', '[Gmail]/Drafts']

[Account 4something]
localrepository = 4something-Local
remoterepository = 4something-Remote

[Repository 4something-Local]
type = Maildir
localfolders = ~/Maildir/4something

[Repository 4something-Remote]
type = IMAP
remotehost = imap.gmail.com
remoteuser = dnouri@4something.com
remotepass = youguessedit
ssl = yes
sslcacertfile = /etc/ssl/certs/ca-certificates.crt
maxconnections = 3
realdelete = no
folderfilter = lambda folder: folder not in ['[Gmail]/Drafts']