🚀 go-pugleaf

> I'm a newcomer, and have just installed MX 3.1c  over CMUIP 6.6. Name
> completion for outgoing smtp isn't working; what am I doing wrong?

MX refers to what you want as "host name expansion."  It happens "just
before PATH identification."  So, if this step failed, you shouldn't be
surprised if the mail was sent to the literal address, rather than to the
expanded address.

Do you have the following logical defined:

(LNM$SYSTEM_TABLE)

  "MX_SITE_DOM_EXPANSION" = "MX_EXE:DOMAIN_EXPANSION"

And is that file present?

I rather suspect that there's nothing wrong with C**/T** (formerly CMU/TEK)
TCP/IP, since IPNCP works alright.  All I can tell you is that version
6.6-4 of IP_ACP and MX 3.1c do correctly expand addresses on my system, and
I didn't have to do anything special to make it happen.

A difference between my system and yours, though, is that your addresses
apparently only have MX records on the nameserver, not A records.  So, the
search to see which addresses are "valid" might not work.