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Issue with Spam engine across all our Inbound Servers

spam engine

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#1 Guest_ryan.men_*

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Posted 06 November 2016 - 01:42 PM

We were facing an intermittent issue with the Spam engine across all our Inbound Mail servers. Due to which, mails sent to the domains hosted on our mail server were rejected with following bounce back:


The mail system


<emailaccount@yourdomain>: host mx3.mailhostbox.com[] said:


Service unavailable; Helo command [ob3-1.mailhostbox.com] blocked using

dbl.zen.dlls-tx.mailrbl.com; v=spf1 a -all 554 5.7.1 Please see


for explanation of the problem. (in reply to RCPT TO command)


This issue has been fixed and we are putting this post for your perusal.


Please feel free to contact our support helpdesk in case you have any queries.

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