zimbra hosted server ip is blacklisted

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ronymicrosoft
Posts: 1
Joined: Thu Aug 17, 2017 7:50 am

zimbra hosted server ip is blacklisted

Post by ronymicrosoft »

Hi Team,
I have recently installed zimbra (ZCS) as our mail server solution. When I check mxtoolbox public ip associated with zimbra server getting blacklsited frequently. Around 150 users mailbloxes are hosted on mail server. I have setup A, MX, SPF, DKIM, recerse DNS records are upto date. Web mail MTA port is 25.
Also if anyone can guide me or any documents regarding safe using smtp 25 port or 465/587.

Thanks,
Rony Microsoft
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