Configure SMTP server postfix

IN PROGRESS
Bids
7
Avg Bid (USD)
$60
Project Budget (USD)
$30 - $250

Project Description:
Dear All,
All emails sent from my server are delivered to the spam folder of (google.com, onet.pl, o2.pl, wp.pl).
It does not matter what is the text message.

I need someone to configure my server to solve this issue. It is dedicated server.
Domain name is: 7lancer.pl
I was checking it using tool and everything seems to be ok .http://www.mxtoolbox.com/
Thank you,
Adam

Skills required:
Computer Security, DNS, Linux, System Admin
About the employer:
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