hi there, my Redhat enterprise 3.0SA mail server went down today, now i think i've found the problem! when i use putty to remotly login it and i use the command '# vi etc/hosts' i see

# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 mail localhost.localdomain localhost
192.168.1.1 senior_main
*??.**.***.*** mail mail.*******.***.***.**

now the two '??' are in yellow and when i try and retype the ip address they both turn yellow again ... could this be the reason why my mail server isn't work?

My guess is, the two yellow highlighted numbers are a string you previously searched on. If you want to check, go back to the prompt and type alias vi. It'll probably show you something like alias vi='vim', in which case, if the yellow highlighting still bothers you, you can just type unalias vi.

Is this anything like "don't eat the yellow snow?"