update plugin/headers config entry
update plugin/headers config entry

use future/past instead of days:

-headers days 5 reject_type temp require From,Date
+headers reject 1 reject_type temp require From,Date future 2 past 15

smtpd/qpsmtpd,priyadi/qpsmtpd,msimerson/qpsmtpd,priyadi/qpsmtpd,sentinelleader/qpsmtpd-dev,sieutruc/qpsmtpd,priyadi/qpsmtpd,sieutruc/qpsmtpd,sieutruc/qpsmtpd,salvis/qpsmtpd,sentinelleader/qpsmtpd-dev,salvis/qpsmtpd,smtpd/qpsmtpd,msimerson/qpsmtpd