Noun. 1. achromatic color-a color lacking hue; white or grey or black. achromatic colour. color, coloring, colouring, colour-a visual attribute of things that results from the light they emit or transmit or reflect; a white color is made up of many different wavelengths of light.
A good candidate for a mail host is a system that connects your systems to the outside world or to a parent domain. 1  Become superuser on the mail host system. 2  Verify the host name configuration. 3  Update. Create an entry for the new mail host in the appropriate hosts file.  Change the correct configuration 1  file. Restart and test your mail configuration.
A localhost is, put plainly, the standard hostname given to the address assigned to the loopback network interface. Translated into an IP address, a localhost is always designated as 127.0.0.1.This may be overwhelming, so let's look at what these things mean.sed this way, the hostname is called a domain name. An example of using a hostname this way would be: hostname.domain. In short, hostname is the nickname that is given to a device connected to a computer network.