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450 4.7.25 Client host rejected

mfarazk86 asked: On #Exchange2013 I am getting the error message as follows, generated the error ‘[{LRT=};{LED=450 4.7.25 Client host rejected: cannot find your hostname, [xxx.xxx.xxx.130]};{FQDN=};{IP=}]’. I am getting this error …

Reverse DNS PTR record

AndrewL64 asked: I have a dedicated server (Ubuntu 18.04 with virtualmin & webmin) which is hosting 7 WordPress sites on it. I have set up MX, DMARC, SPF and DKIM …