The file service protocols are the obvious critical standards, but there are many others that we support as well, including standards for DNS, telnet, inetd, RPC, XDR, portmapper, lockd, NIS, ARP, RMT, rdate, NDMP, syslog, SMTP, etc. Most (if not all) of these have RFCs describing them. We support many of these in client-mode only, such as NIS, DNS, SMTP, etc., because our goal is not to serve these protocols, but to be a client to them in order to simplify administration.
If NetApp claims to support SMTP, it would be nice if you could fix the bug where SMTP commands from a NetApp box are only terminated with LF, not CRLF as RFC 821 explicitly specifies.
(I reported this on 12 March this year, and later heard that it was acknowledged as a bug, bug #4268.)
Steinar Haug, Nethelp consulting, sthaug@nethelp.no