John,
you need to properly configure the DNS entries for your systems and/or
adapt the smtpd_* restrictions on the receiving system.
> warning: 71.39.113.15: address not listed for hostname sbs.rtgis.com
$ nslookup sbs.rtgis.com
Non-authoritative answer:
Name: sbs.rtgis.com
Address: 66.232.81.14
According to DNS, sbs.rtgis.com should be at 66.232.81.14, but the
connect actually is from 71.39.113.15 . Configure that system with the
proper hostname or add the 71.... address as another A record to that DNS.
> NOQUEUE: reject: RCPT from unknown[71.39.117.85]: 554 5.7.1 Client host
> rejed: cannot find your hostname
$ nslookup 71.39.117.85
** server can't find 85.117.39.71.in-addr.arpa.: NXDOMAIN
Make sure their reverse entries are publicly available (or, as said
above, adapt the smtpd* restrictions).
HTH,
-hannes
