Exchange Server 2013

Header Analysis:

1. As per the header analysis 167.89.100.167 come as 46 times blacklisted by ABUSEIP & 6 times blacklisted by IPVOID.
2. SKIM, DMARC, DKIM policy is not enabled.
3. As Checked return path is changed.
4. The first link was scanned 17 times on urlscan.io
5. The second link was scanned 205 times on urlscan.io

Please provide the solution step by step

Satish Chaturvedi Mob-9990806001