Sendmail error mesage

[Chris Kottaridis]

The output of my crontabs seem to be getting deferred. My nightly
backups are run out of operator's crontab.
The crontab has:

MAILTO chriskot at quietwind.net

I see this error message in the maillogs:

Oct 25 10:53:56 admin sm-mta[97771]: l9MJH0ZG068875:
to=<chriskot at quietwind.net>, ctladdr=<operator at admin.wagnerleader
ship.org> (2/5), delay=2+21:36:56, xdelay=00:00:01, mailer=esmtp,
pri=12901052, relay=mail.globalharvest.org. [74.52.23
7.48], dsn=4.3.0, stat=Deferred: 451 Could not complete sender verify
callout


What does "451 Could not complete sender verify callout" mean ?


Thanks
    Chris Kottaridis   (chriskot at quietwind.net)