-----Original Message-----
From: Mail Delivery System [mailto:Mailer-Daemon@cp-42.webhostbox.net]
Sent: Thursday, May 3, 2018 2:44 PM
To: munkhchimeg.b@altaigroup.mn
Subject: Mail delivery failed: returning message to sender

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:

hr@altaiconstruction.mn
host mx2.mailhostbox.com [162.222.225.7]
SMTP error from remote mail server after initial connection:
521-5.7.1 Service unavailable; client [209.99.16.57] blocked using zen.spamhaus.org
521 5.7.1 Please see
http://support.mailhostbox.com/email-administrators-guide-error-codes/ for explanation of the problem.
bayarbileg.b@altaiconstruction.mn
host mx2.mailhostbox.com [162.222.225.7]
SMTP error from remote mail server after initial connection:
521-5.7.1 Service unavailable; client [209.99.16.57] blocked using zen.spamhaus.org
521 5.7.1 Please see
http://support.mailhostbox.com/email-administrators-guide-error-codes/ for explanation of the problem.
badamtsetseg.b@altaiconstruction.mn
host mx2.mailhostbox.com [162.222.225.7]
SMTP error from remote mail server after initial connection:
521-5.7.1 Service unavailable; client [209.99.16.57] blocked using zen.spamhaus.org
521 5.7.1 Please see
http://support.mailhostbox.com/email-administrators-guide-error-codes/ for explanation of the problem.
hr@mdm.mn
host mail.mdm.mn [208.91.198.206]
SMTP error from remote mail server after RCPT TO:<hr@mdm.mn>:
554 The IP Address of the sender (209.99.16.57) was found in a DNS blacklist database and was therefore refused.
ceo@mdm.mn
host mail.mdm.mn [208.91.198.206]
SMTP error from remote mail server after RCPT TO:<ceo@mdm.mn>:
554 The IP Address of the sender (209.99.16.57) was found in a DNS blacklist database and was therefore refused.
hr@altaiagrotrade.mn
host mail.altaiagrotrade.mn [208.91.199.52]
SMTP error from remote mail server after RCPT TO:<hr@altaiagrotrade.mn>:
554 The IP Address of the sender (209.99.16.57) was found in a DNS blacklist database and was therefore refused.