WHMCS every email sending time genarating this message

Dear All,

I'm new ti WHMCS i'm using WHMCS Web Host License my Version: 5.2.7 my problem is when i'm sending emails in my client it have generating this message for every emails even support ticket department also please help me how to fix it,

generate message is like this

SMTP -> get_lines(): $data was ""
SMTP -> get_lines(): $str is "220-cloudnode.ewebcities.net ESMTP Exim 4.80.1 #2 Wed, 25 Sep 2013 12:10:30 +0530 "
SMTP -> get_lines(): $data is "220-cloudnode.ewebcities.net ESMTP Exim 4.80.1 #2 Wed, 25 Sep 2013 12:10:30 +0530 "
SMTP -> get_lines(): $data was "220-cloudnode.ewebcities.net ESMTP Exim 4.80.1 #2 Wed, 25 Sep 2013 12:10:30 +0530 "
SMTP -> get_lines(): $str is "220-We do not authorize the use of this system to transport unsolicited, "
SMTP -> get_lines(): $data is "220-cloudnode.ewebcities.net ESMTP Exim 4.80.1 #2 Wed, 25 Sep 2013 12:10:30 +0530 220-We do not authorize the use of this system to transport unsolicited, "
SMTP -> get_lines(): $data was "220-cloudnode.ewebcities.net ESMTP Exim 4.80.1 #2 Wed, 25 Sep 2013 12:10:30 +0530 220-We do not authorize the use of this system to transport unsolicited, "
SMTP -> get_lines(): $str is "220 and/or bulk e-mail. "
SMTP -> get_lines(): $data is "220-cloudnode.ewebcities.net ESMTP Exim 4.80.1 #2 Wed, 25 Sep 2013 12:10:30 +0530 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail. "
SMTP -> FROM SERVER:220-cloudnode.ewebcities.net ESMTP Exim 4.80.1 #2 Wed, 25 Sep 2013 12:10:30 +0530 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail.

Thanks.