[Postfixbuch-users] not allowed to send mail

[Hajo Locke]

>> Oct 24 12:57:05 server2 postfix/smtp[24147]: D8014C14001:
>> to=<xxx at opertis.de>, relay=mail.hewi.de[80.149.110.117]:25, delay=2, 
>> delays=0.1/0.06/0.3/1.6, dsn=5.0.0, status=bounced (host 
>> mail.hewi.de[80.149.110.117] said: 550 77.236.98.239 is not allowed to 
>> send mail from xxx.de (in reply to RCPT TO command))

hört sich an wie SPF Spamschutz am Zielserver?

Hajo