An example config file is .m2m.conf. If it is put in ~/ it is used as
the sole "Default" account to be used. Alternatively, ~/.m2m.conf can be
a directory with account config files (whose filename is taken to be the
'account name') which are all used when run.
The config files have the POP3S server config details and the Maildir location:
username: POP3S username
password: POP3S password
tlsservername: Server domainname according to the certificate
serveraddress: IP/Domainname address of the server
proxyaddress: Address of the proxy server (default: not used)
disabletls: true/false - Disable TLS or not (default)
keep: true/false - Keep messages on the POP3S server or not (default)
maildirpath: Path to the Maildir directory (default: ~/Maildir)