keep receiving error log

[handsprice]

My server keep receiving error log for last few days, below is the error log, can anyone guide me to solve the problem.

Jun 23 14:36:42 domain-server postfix/smtp[3869]: D493F1CBFC: to=<ex.ex@asia-assistance.com>, relay=mx1.mailhostbox.com[11.22.33.2], delay=101000, status=deferred (host mx1.mailhostbox.com[11.22.33.2] said: 421 4.7.0 mx1.mail.pw Error: too many errors (in reply to RCPT TO command))
Jun 23 15:43:16 domain-server postfix/qmgr[6151]: D493F1CBFC: from=<wtw@noblehouse-labuan.com>, size=45503, nrcpt=5 (queue active)

Jun 23 15:43:19 domain-server postfix/smtp[4230]: D493F1CBFC: host mx2.mailhostbox.com[44.55.66.777] said: 450 4.7.1 Client host rejected: cannot find your reverse hostname, [123.44.567.789] (in reply to RCPT TO command)

Jun 23 15:43:19 domain-server postfix/smtp[4230]: D493F1CBFC: host mx2.mailhostbox.com[44.55.66.777] said: 450 4.7.1 Client host rejected: cannot find your reverse hostname, [123.44.567.789] (in reply to RCPT TO command)

Jun 23 15:43:21 domain-server postfix/smtp[4230]: D493F1CBFC: to=<florence.loke@asia-assistance.com>, relay=mx1.mailhostbox.com[11.22.33.2], delay=104999, status=deferred (host mx1.mailhostbox.com[11.22.33.2] said: 450 4.7.1 Client host rejected: cannot find your reverse hostname, [123.44.567.789] (in reply to RCPT TO command))

Jun 23 15:43:22 domain-server postfix/smtp[4230]: D493F1CBFC: to=<kelly.guee@asia-assistance.com>, relay=mx1.mailhostbox.com[11.22.33.2], delay=105000, status=deferred (host mx1.mailhostbox.com[11.22.33.2] said: 450 4.7.1 Client host rejected: cannot find your reverse hostname, [123.44.567.789] (in reply to RCPT TO command))


thanks

[phoenix]

Originally Posted by handsprice

Jun 23 15:43:22 domain-server postfix/smtp[4230]: D493F1CBFC: to=<kelly.guee@asia-assistance.com>, relay=mx1.mailhostbox.com[11.22.33.2], delay=105000, status=deferred (host mx1.mailhostbox.com[11.22.33.2] said: 450 4.7.1 Client host rejected: cannot find your reverse hostname, [123.44.567.789] (in reply to RCPT TO command))

The error message tells you what's wrong with your configuration, you need a reverse DNS configured for your IP address. You need to speak to your ISP, they are the only ones that can fix it.