This error might pop up as you are trying to setup your email server. Fear not, there is a good chance that this is not a major issue and can be solved by running one single line of code in the command line. yum install…
Reverse DNS is a common method used to help keep your emails out of the dreaded spam filters. Fortunately, once you know how, reverse DNS is a quick and easy way to improve the trustability of your emails. Reverse DNS alone is not enough to…