Strato und Greylisting

[Alex]

Hallo zusammen,

die Server des Providers Strato nehmen nach dem Greylisting-reject für 
die erneute Zustellung eine andere IP-Adresse und
kommen nicht durch das Greylisting hindurch.
Der Absender (ein Strato-Kunde) bekommt Unzustellbarkeitnachrichten 
"Fehler bei der Nachrichtenzustellung... Greylisted for 300 seconds".

May 19 17:14:37 I79 postfix/smtpd[3268]: NOQUEUE: reject: RCPT from 
mo6-p04-ob.smtp.rzone.de[2a01:238:20a:202:5304::5]: 450 4.2.0 
<mo6-p04-ob.smtp.rzone.de[2a01:238:20a:202:5304::5]>: Client host 
rejected: Greylisted for 300 seconds; from=<from at fromabc.de> 
to=<to at toabc.de> proto=ESMTP helo=<mo6-p04-ob.smtp.rzone.de>
May 19 17:20:18 I79 postfix/smtpd[3268]: NOQUEUE: reject: RCPT from 
mo6-p04-ob.smtp.rzone.de[2a01:238:20a:202:5304::12]: 450 4.2.0 
<mo6-p04-ob.smtp.rzone.de[2a01:238:20a:202:5304::12]>: Client host 
rejected: Greylisted for 300 seconds; from=<from at fromabc.de> 
to=<to at toabc.de> proto=ESMTP helo=<mo6-p04-ob.smtp.rzone.de>
May 19 17:29:05 I79 postfix/smtpd[3268]: NOQUEUE: reject: RCPT from 
mo6-p04-ob.smtp.rzone.de[2a01:238:20a:202:5304::11]: 450 4.2.0 
<mo6-p04-ob.smtp.rzone.de[2a01:238:20a:202:5304::11]>: Client host 
rejected: Greylisted for 300 seconds; from=<from at fromabc.de> 
to=<to at toabc.de> proto=ESMTP helo=<mo6-p04-ob.smtp.rzone.de>
May 19 17:43:56 I79 postfix/smtpd[26721]: NOQUEUE: reject: RCPT from 
mo6-p04-ob.smtp.rzone.de[2a01:238:20a:202:5304::6]: 450 4.2.0 
<mo6-p04-ob.smtp.rzone.de[2a01:238:20a:202:5304::6]>: Client host 
rejected: Greylisted for 300 seconds; from=<from at fromabc.de> 
to=<to at toabc.de> proto=ESMTP helo=<mo6-p04-ob.smtp.rzone.de>
May 19 17:50:18 I79 postfix/smtpd[32116]: NOQUEUE: reject: RCPT from 
mo6-p00-ob.smtp.rzone.de[2a01:238:20a:202:5300::4]: 450 4.2.0 
<mo6-p00-ob.smtp.rzone.de[2a01:238:20a:202:5300::4]>: Client host 
rejected: Greylisted for 300 seconds; from=<from at fromabc.de> 
to=<to at toabc.de> proto=ESMTP helo=<mo6-p00-ob.smtp.rzone.de>
May 19 17:56:31 I79 postfix/smtpd[32116]: NOQUEUE: reject: RCPT from 
mo6-p00-ob.smtp.rzone.de[2a01:238:20a:202:5300::2]: 450 4.2.0 
<mo6-p00-ob.smtp.rzone.de[2a01:238:20a:202:5300::2]>: Client host 
rejected: Greylisted for 300 seconds; from=<from at fromabc.de> 
to=<to at toabc.de> proto=ESMTP helo=<mo6-p00-ob.smtp.rzone.de>
May 19 18:03:37 I79 postfix/smtpd[7892]: NOQUEUE: reject: RCPT from 
mo6-p00-ob.smtp.rzone.de[2a01:238:20a:202:5300::1]: 450 4.2.0 
<mo6-p00-ob.smtp.rzone.de[2a01:238:20a:202:5300::1]>: Client host 
rejected: Greylisted for 300 seconds; from=<from at fromabc.de> 
to=<to at toabc.de> proto=ESMTP helo=<mo6-p00-ob.smtp.rzone.de>
May 19 18:08:31 I79 postfix/smtpd[10212]: NOQUEUE: reject: RCPT from 
mo6-p00-ob.smtp.rzone.de[2a01:238:20a:202:5300::12]: 450 4.2.0 
<mo6-p00-ob.smtp.rzone.de[2a01:238:20a:202:5300::12]>: Client host 
rejected: Greylisted for 300 seconds; from=<from at fromabc.de> 
to=<to at toabc.de> proto=ESMTP helo=<mo6-p00-ob.smtp.rzone.de>

Die Server haben laut DNS 12 IPv6 Adressen und 5 bis 10 IPv4 Adressen.
Hatte jemand auch schon so ein Problem und wie ist er damit umgegangen?

Gruß,
Alex