Required software development freelancer for Fix Mail Server Blocking of Safe emails job

Looking for an experienced Mail Server Admin with extensive knowledge in fixing and configuring mail server issues:
Our mail-server is on Linux Ubuntu and Postfix:

Scope of this job:
-Find out why our Safe emails being blocked by our mailserver antispam filter
-Unlist us from the spamcop blacklists
-Improve our antispam software

Issues list:
Sample of issues will share as a screen shots with shortlisted candidates

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Skills & Expertise Required

software development