[deanhills]

@Manal These are the places where I usually check blacklisting as I trust them.   Otherwise there's just so many false positives out there.  
https://www.whatismyip.com/blacklist-check/

Doesn't look as though your IP is blacklisted.

I also always check Spamhouse as I trust them.  If they say an IP is blacklisted then it really is - if not, it isn't.

https://www.spamhaus.org/query/ip/188.165.45.120

188.165.45.120 is not listed in the SBL

188.165.45.120 is not listed in the PBL

188.165.45.120 is not listed in the XBL

What is SBL?

The Spamhaus Block List ("SBL") Advisory is a database of IP addresses from which Spamhaus does not recommend the acceptance of electronic mail.

What is PBL?

The Spamhaus PBL is a DNSBL database of end-user IP address ranges which should not be delivering unauthenticated SMTP email to any Internet mail server except those provided for specifically by an ISP for that customer's use. The PBL helps networks enforce their Acceptable Use Policy for dynamic and non-MTA customer IP ranges.

What is XBL?

The Spamhaus Exploits Block List (XBL) is a realtime database of IP addresses of hijacked PCs infected by illegal 3rd party exploits, including open proxies (HTTP, socks, AnalogX, wingate, etc), worms/viruses with built-in spam engines, and other types of trojan-horse exploits.