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"5.7.1 Sender ID (PRA) Not Permitted"?

From: Dave McGuire (mcguireneurotica.com)
Date: Fri Oct 26 2007 - 13:42:24 CDT

   Hi folks. One of my customers is relaying mail through my server,
and it's bouncing with a log message that I've never seen before:

Oct 26 14:22:05 mail postfix/smtp[6116]: 363CE1981EC:
to=<xxxyyy.zzz>, relay=office.fhsaa.org[72.243.244.90]:25,
delay=3.3, delays=0.22/0/0.49/2.6, dsn=5.7.1, status=bounced (host
office.fhsaa.org[72.243.244.90] said: 550 5.7.1 Sender ID (PRA) Not
Permitted (in reply to end of DATA command))

   I'm running Postfix v2.4.0 on that server, and my other outbound
mail is flowing fine. What causes this, and how can I fix it, does
anyone know offhand?

             Thanks,
             -Dave

--
Dave McGuire
Port Charlotte, FL
Farewell Ophelia, 9/22/1991 - 7/25/2007