Hi, linuman

Your cron and cdb settings are verymuch valied but
technically it is not a good Idea. clearopensmtp  will
not clear the relay opened for that IP. You need to
check the cdb database either it will upend the relay
database or overwrite the database.
If it overwrites, you are safe or else one fine day
your mail server will listed in RBL site. ;-)

Thank you for your good advice. I have already set clearopensmtp in cron service.

40 * * * * /home/vpopmail/bin/clearopensmtp 2>&1 > /dev/null

Vpopmail will erase IP in 3 hours by default setting.
(configure option --enable-relay-clear-minutes=180)

For realize POP before SMTP,
I think it necessary to build VPN for security.
because user password leak.
Not encrypted password !!

Yasuyuki Toyoda
From Japan Tokyo

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