Server's Hostname

[ISOS6]

Must Server's Hostname be like server.domain.com? Or I can use what ever I want, can the name be only server without domain?

[mr.applesauce]

Its best to use an actual resolving host since that will be used for what your mail responds as.

[ISOS6]

Thanks for replying!

Because One.com uses only srv1 srv2 etc..