Hmmm...
Code:
2007-05-10 15:40:07 1Hm8sD-0001DJ-HN SMTP error from remote mail server after RCPT TO:<nxxxxxx@kxxxxxx.nxxx>: host mx00.uxxx.de [62.146.106.39]: 450 4.7.1 <nxxxxxx@kxxxxxx.nxxx>: Recipient address rejected: You are greylisted for 300 seconds...
2007-05-10 15:40:07 1Hm8sD-0001DJ-HN == nxxxxxx@kxxxxxx.nxxx R=dnslookup T=remote_smtp defer (-44): SMTP error from remote mail server after RCPT TO:<nxxxxxx@kxxxxxx.nxxx>: host mx01.udag.de [62.146.106.40]: 450 4.7.1 <nxxxxxx@kxxxxxx.nxxx>: Recipient address rejected: You are greylisted for 300 seconds...
2007-05-10 15:53:55 1Hm8sD-0001DJ-HN == nxxxxxx@kxxxxxx.nxxx routing defer (-51): retry time not reached
2007-05-10 16:23:56 1Hm8sD-0001DJ-HN => nxxxxxx@kxxxxxx.nxxx R=dnslookup T=remote_smtp H=mx00.uxxx.de [62.146.106.39]
2007-05-10 20:34:39 H=mail-in-13.arcor-online.net [151.189.21.53] F=<nxxxxxx@kxxxxxx.nxxx> temporarily rejected RCPT <Kxxxx@Exxxxx.de>: greylisted.
2007-05-11 02:30:38 H=mail-in-13.arcor-online.net [151.189.21.53] F=<nxxxxxx@kxxxxxx.nxxx> temporarily rejected RCPT <Kxxxx@Exxxxx.de>: greylisted.
2007-05-11 10:31:45 H=mail-in-13.arcor-online.net [151.189.21.53] F=<nxxxxxx@kxxxxxx.nxxx> temporarily rejected RCPT <Kxxxx@Exxxxx.de>: greylisted.
2007-05-11 15:27:10 H=mail-in-05.arcor-online.net [151.189.21.45] F=<nxxxxxx@kxxxxxx.nxxx> temporarily rejected RCPT <Kxxxx@Exxxxx.de>: greylisted.
2007-05-11 18:28:00 1HmXyK-0000L0-KR <= nxxxxxx@kxxxxxx.nxxx H=mail-in-05.arcor-online.net [151.189.21.45] P=esmtps X=TLS-1.0
HE_RSA_AES_256_CBC_SHA1:32 DN="C=DE,ST=Hessen,L=Eschborn,O=Arcor AG und Co.KG,OU=Arcor Online GmbH,CN=mx.arcor.de" S=1602 id=2xxxxxxxxxxxxx.Cxxxxxxxxxx@mail-in-05.arcor-online.net
2007-05-11 22:04:28 H=mail-in-02.arcor-online.net [151.189.21.42] F=<nxxxxxx@kxxxxxx.nxxx> temporarily rejected RCPT <Kxxxx@Exxxxx.de>: greylisted.
2007-05-11 22:30:29 H=mail-in-13.arcor-online.net [151.189.21.53] F=<nxxxxxx@kxxxxxx.nxxx> temporarily rejected RCPT <Kxxxx@Exxxxx.de>: greylisted.
2007-05-12 00:27:45 1HmdaT-0000gB-2N <= nxxxxxx@kxxxxxx.nxxx H=mail-in-02.arcor-online.net [151.189.21.42] P=esmtps X=TLS-1.0
HE_RSA_AES_256_CBC_SHA1:32 DN="C=DE,ST=Hessen,L=Eschborn,O=Arcor AG und Co.KG,OU=Arcor Online GmbH,CN=mx.arcor.de" S=1603 id=2xxxxxxxxxxxxx.3xxxxxxxxxx@mail-in-07.arcor-online.net
2007-05-12 10:30:18 H=mail-in-13.arcor-online.net [151.189.21.53] F=<nxxxxxx@kxxxxxx.nxxx> temporarily rejected RCPT <Kxxxx@Exxxxx.de>: greylisted.
2007-05-12 14:06:27 H=mail-in-01.arcor-online.net [151.189.21.41] F=<nxxxxxx@kxxxxxx.nxxx> temporarily rejected RCPT <Kxxxx@Exxxxx.de>: greylisted.
2007-05-12 16:39:23 1Hmskl-000236-J1 <= nxxxxxx@kxxxxxx.nxxx H=mail-in-01.arcor-online.net [151.189.21.41] P=esmtps X=TLS-1.0
HE_RSA_AES_256_CBC_SHA1:32 DN="C=DE,ST=Hessen,L=Eschborn,O=Arcor AG und Co.KG,OU=Arcor Online GmbH,CN=mx.arcor.de" S=1603 id=2xxxxxxxxxxxxx.Cxxxxxxxxxx@mail-in-09.arcor-online.net
seems that arcor has a bit buggy mail setup. They seems to send out every mail only after more than 4 hours. Then the greylisting ticket is not valid anymore. Also it seems to use different senders for the same mail.
Well, anyway, I got the information from Bluebird as you could see.