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From: Cybertime Hostmaster (hostmaster_at_cybertime.net)
Date: Mon Feb 10 2003 - 20:13:27 CST

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    Feb 10 19:30:57 ns1 postfix/smtp[6482]: 3E7571BF28: to=<grayscif.com>,
    relay=ns1.scif.com[206.202.64.9], delay=111436, stat us=deferred (host
    ns1.scif.com[206.202.64.9] said: 451 4.1.8 Domain of sender address
    grayrunlevel6.com does not resolve)
    Feb 10 19:30:58 ns1 postfix/smtp[6483]: BE1731BE7C: to=<grayscif.com>,
    relay=ns1.scif.com[206.202.64.9], delay=115703, stat us=deferred (host
    ns1.scif.com[206.202.64.9] said: 451 4.1.8 Domain of sender address
    grayrunlevel6.com does not resolve)

    This is the other end saying that your domain name "does not resolve".

    % host runlevel6.com
    runlevel6.com has address 66.159.220.130
    runlevel6.com mail is handled (pri=10) by ns1.runlevel6.com
    % host ns1.runlevel6.com
    ns1.runlevel6.com has address 66.159.220.130
    % host 66.159.220.130
    130.220.159.66.IN-ADDR.ARPA domain name pointer
    netblock-66-159-220-130.dslextreme.com

    Perhaps they have a strict reverse lookup policy.

    Try sending mail somewhere else.

    --Eric