Use of CNAMES Question

[tnaves at linkwest.net]

I have a server that acts as a mail server, an http sever, an ftp server
and a news server.  I have set up my records like this:

mail	IN	A	192.168.1.25
ftp	IN	CNAME	mail
www	IN	CNAME 	mail
news	IN	CNAME	mail

Is this orthodox?

Thanks, 

Tom Naves