smtp - Email is bouncing off from few mail providers -

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when im trying send email domain polish email providers onet.pl , gazeta.pl im getting bounce message: 

     message sent not delivered 1 or more of recipients. permanent error. following address(es) failed:    xxx@gazeta.pl     smtp error remote mail server after helo mydomain.com:     host mx.poczta.gazeta.pl [1.1.1.1]: 503 5.7.0 error:     access denied unknown[2.2.2.2]

i have configured ptr , mx record. please help.

there many possibilities mail denied. please check :

1) mail server ip address should not blacklisted anywhere. can check http://multirbl.valli.org/lookup/

2) make sure recipient mail server listen on port using i.e. port 25. please check if port 587 works. can try port 465 tls.

3) check if antivirus application installed on side causes issue.


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