Permanent Error

I was able to send mails to the address, lageb@kth.se until today. Attempt returned an error, please see below. I tried to send an email to the same address using gmail and it was successful.

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.

lageb@kth.se, ERROR_CODE :554, ERROR_CODE :5.7.0 Reject, id=63855-62 - spam

Received:from [192.168.8.100] (129.56.0.162 [129.56.0.162]) by mx.zohomail.com

with SMTPS id 1483124795227616.6060155523364; Fri, 30 Dec 2016 11:06:35 -0800 (PST)

Message-ID:<64A12BAD-8EE6-40B9-BF2E-07A6CCBF3D69@9bitsng.com>

Date:Fri, 30 Dec 2016 20:06:14 +0100

From:Okey Igwegbe <okey.igwegbe@9bitsng.com>

User-Agent:Microsoft-MacOutlook/f.1d.0.161209

To:Lage Bergström <lageb@kth.se>

Subject:PREFIXES OF MOBILE NETWORKS IN NIGERIA

Content-Type:multipart/mixed;

boundary="B_3565973186_186389625"