helo: added is_plain_ip to lenient checks
helo: added is_plain_ip to lenient checks

there's no excuse for a client to ever send a raw IP, and I have yet to see a valid client do it

sieutruc/qpsmtpd,priyadi/qpsmtpd,priyadi/qpsmtpd,salvis/qpsmtpd,salvis/qpsmtpd,smtpd/qpsmtpd,priyadi/qpsmtpd,smtpd/qpsmtpd,msimerson/qpsmtpd,sieutruc/qpsmtpd,msimerson/qpsmtpd,sieutruc/qpsmtpd