Can a Callplus/Slingshot/Tranzpeer postmaster contact me. We're having issue with forward emails for our clients to Callplus addresses, the clients are complaining mail is being dropped. PS: I have tried contacting postmaster(a)callplus.net.nz and this is what I got after 4 days:

This message was created automatically by mail delivery software. A message that you sent has not yet been delivered to one or more of its recipients after more than 72 hours on the queue on mxdsrv1.tranzpeer.net.

The message identifier is: 1WTNur-0005YH-G5 The subject of the message is: Mail server issue: The date of the message is: Fri, 28 Mar 2014 16:47:21 +1300

The address to which the message has not yet been delivered is:

sysops(a)noc.tranzpeer.net (generated from postmaster(a)callplus.net.nz) Delay reason: SMTP error from remote mail server after RCPT TO:: host 192.168.69.1 [192.168.69.1]: 451 4.3.2 Please try again later

Our logs are full of the following: Apr 8 12:41:40 tiny postfix/smtp[14531]: 4FE0DDFA92F: host mxi1.callplus.net.nz[202.180.66.203] refused to talk to me: 421 4.7.0 Not allowed. Apr 8 12:41:40 tiny postfix/smtp[14532]: B7E63DFA8DC: host mxi1.callplus.net.nz[202.180.66.203] refused to talk to me: 421 4.7.0 Not allowed. Apr 8 12:41:40 tiny postfix/smtp[14537]: 9B205DFA940: host mxi1.callplus.net.nz[202.180.66.203] refused to talk to me: 421 4.7.0 Not allowed. Apr 8 12:41:40 tiny postfix/smtp[14537]: 9B205DFA940: to=, relay=mxi2.callplus.net.nz[202.180.66.204]:25, delay=1347, delays=1346/0.58/0.06/0, dsn=4.7.0, status=deferred (host mxi2.callplus.net.nz[202.180.66.204] refused to talk to me: 421 4.7.0 Not allowed.) Apr 8 12:41:52 tiny postfix/smtp[14530]: 4B069DFA8E2: host mxi1.callplus.net.nz[202.180.66.203] said: 451 4.3.2 Please try again later (in reply to RCPT TO command) Apr 8 12:41:52 tiny postfix/smtp[14531]: 4FE0DDFA92F: to=, relay=mxi2.callplus.net.nz[202.180.66.204]:25, delay=1391, delays=1379/0.25/0.1/12, dsn=4.3.2, status=deferred (host mxi2.callplus.net.nz[202.180.66.204] said: 451 4.3.2 Please try again later (in reply to RCPT TO command)) Apr 8 12:41:52 tiny postfix/smtp[14532]: B7E63DFA8DC: to=, relay=mxi2.callplus.net.nz[202.180.66.204]:25, delay=1866, delays=1853/0.29/0.1/12, dsn=4.3.2, status=deferred (host mxi2.callplus.net.nz[202.180.66.204] said: 451 4.3.2 Please try again later (in reply to RCPT TO command)) Apr 8 12:42:04 tiny postfix/smtp[14530]: 4B069DFA8E2: to=, relay=mxi2.callplus.net.nz[202.180.66.204]:25, delay=1790, delays=1766/0.25/12/12, dsn=4.3.2, status=deferred (host mxi2.callplus.net.nz[202.180.66.204] said: 451 4.3.2 Please try again later (in reply to RCPT TO command)) Apr 8 12:56:58 tiny postfix/smtp[17081]: E3622DFA91C: host mxi1.callplus.net.nz[202.180.66.203] refused to talk to me: 421 4.7.0 Not allowed. Apr 8 12:56:59 tiny postfix/smtp[17081]: E3622DFA91C: to=, relay=mxi2.callplus.net.nz[202.180.66.204]:25, delay=0.07, delays=0.01/0/0.05/0, dsn=4.7.0, status=deferred (host mxi2.callplus.net.nz[202.180.66.204] refused to talk to me: 421 4.7.0 Not allowed.) Apr 8 13:00:24 tiny postfix/smtp[17832]: 061A4DFA8F6: host mxi1.callplus.net.nz[202.180.66.203] said: 451 4.3.2 Please try again later (in reply to RCPT TO command) Apr 8 13:00:36 tiny postfix/smtp[17832]: 061A4DFA8F6: to=, relay=mxi2.callplus.net.nz[202.180.66.204]:25, delay=24, delays=0.02/0.01/12/12, dsn=4.3.2, status=deferred (host mxi2.callplus.net.nz[202.180.66.204] said: 451 4.3.2 Please try again later (in reply to RCPT TO command)) Apr 8 13:01:22 tiny postfix/smtp[17829]: D7FB0DFA91F: host mxi1.callplus.net.nz[202.180.66.203] said: 451 4.3.2 Please try again later (in reply to RCPT TO command) Apr 8 13:01:34 tiny postfix/smtp[17829]: D7FB0DFA91F: to=, relay=mxi2.callplus.net.nz[202.180.66.204]:25, delay=25, delays=0.64/0.04/12/12, dsn=4.3.2, status=deferred (host mxi2.callplus.net.nz[202.180.66.204] said: 451 4.3.2 Please try again later (in reply to RCPT TO command)) Apr 8 13:02:06 tiny postfix/smtp[17851]: 4F55DDFA934: host mxi1.callplus.net.nz[202.180.66.203] said: 451 4.3.2 Please try again later (in reply to RCPT TO command) Apr 8 13:02:15 tiny postfix/smtp[17832]: 1ABBEDFA0E0: host mxi1.callplus.net.nz[202.180.66.203] said: 451 4.3.2 Please try again later (in reply to RCPT TO command) Apr 8 13:02:18 tiny postfix/smtp[17851]: 4F55DDFA934: to=, relay=mxi2.callplus.net.nz[202.180.66.204]:25, delay=24, delays=0.02/0/12/12, dsn=4.3.2, status=deferred (host mxi2.callplus.net.nz[202.180.66.204] said: 451 4.3.2 Please try again later (in reply to RCPT TO command)) Apr 8 13:02:27 tiny postfix/smtp[17832]: 1ABBEDFA0E0: to=, relay=mxi2.callplus.net.nz[202.180.66.204]:25, delay=24, delays=0.01/0.01/12/12, dsn=4.3.2, status=deferred (host mxi2.callplus.net.nz[202.180.66.204] said: 451 4.3.2 Please try again later (in reply to RCPT TO command)) Apr 8 13:15:04 tiny postfix/smtp[20825]: 4D5B9DFA923: host mxi1.callplus.net.nz[202.180.66.203] said: 451 4.3.2 Please try again later (in reply to RCPT TO command) Apr 8 13:15:16 tiny postfix/smtp[20825]: 4D5B9DFA923: to=, relay=mxi2.callplus.net.nz[202.180.66.204]:25, delay=24, delays=0.07/0/12/12, dsn=4.3.2, status=deferred (host mxi2.callplus.net.nz[202.180.66.204] said: 451 4.3.2 Please try again later (in reply to RCPT TO command)) Apr 8 13:16:39 tiny postfix/smtp[21318]: 377AFDFA8DC: host mxi1.callplus.net.nz[202.180.66.203] said: 451 4.3.2 Please try again later (in reply to RCPT TO command) Apr 8 13:16:51 tiny postfix/smtp[21318]: 377AFDFA8DC: to=, relay=mxi2.callplus.net.nz[202.180.66.204]:25, delay=24, delays=0.01/0/12/12, dsn=4.3.2, status=deferred (host mxi2.callplus.net.nz[202.180.66.204] said: 451 4.3.2 Please try again later (in reply to RCPT TO command)) Apr 8 13:24:14 tiny postfix/smtp[21330]: 8FF10DFA8E2: host mxi1.callplus.net.nz[202.180.66.203] said: 451 4.3.2 Please try again later (in reply to RCPT TO command) Apr 8 13:31:51 tiny postfix/smtp[24414]: 1ABBEDFA0E0: host mxi1.callplus.net.nz[202.180.66.203] said: 451 4.3.2 Please try again later (in reply to RCPT TO command) etc... Thanks. -- Jean-Francois Pirus | Technical Manager francois(a)clearfield.com | Mob +64 21 640 779 | DDI +64 9 282 3401 Clearfield Software Ltd | Ph +64 9 358 2081 | www.clearfield.com