Cannot receive email from gmail only.

Recently i have installed sentora in centos 7 after configuring dns and every thing i am unable receive mail only from gmail i am able to receive from yahoo and other domains 

below i am posting the bounce mail i am getting form gmail

The response from the remote server was:
550 5.1.1 <test@a1ideaz.com>: Recipient address rejected: User unknown in virtual alias table Please see http://support.mailhostbox.com/email-administrators-guide-error-codes/ for explanation of the problem.

Final-Recipient: rfc822; test@a1ideaz.com
Action: failed
Status: 5.1.1
Remote-MTA: dns; us2.mx1.mailhostbox.com. (208.91.199.202, the server for the
 domain a1ideaz.com.)
Diagnostic-Code: smtp; 550-5.1.1 <test@a1ideaz.com>: Recipient address rejected: User unknown in virtual alias table
 550 5.1.1 Please see http://support.mailhostbox.com/email-administrators-guide-error-codes/ for explanation of the problem.
Last-Attempt-Date: Fri, 28 Apr 2017 10:32:25 -0700 (PDT)


---------- Forwarded message ----------
From: Praveen Elangovan <email.praveene@gmail.com>
To: test@a1ideaz.com
Cc: 
Bcc: 
Date: Fri, 28 Apr 2017 23:02:23 +0530
Subject: tesat
teast


Mail delivery report from MXTOOLBOX below
https://mxtoolbox.com/deliverability/d90...4dd1339add