sendmail question

[David Banning]

I am running a machine which is on a dynamic dns ppp connection.
The machines name is "optex", so when john mails david locally
sendmail sees it as john at optex sending to david at optex it seems.

Sendmail seems to have a problem with this, as the log states;
Mar 29 22:51:18 optex sendmail[55008]: My unqualified host name (optex) unknown; sleeping for retry
 
Whats the best way of dealing with this? I want to sendmail locally,
send mail out masquerading, but we don't need sendmail to receive
as the local users take off a pop server directly with their mail
clients.

Here is my *mc files;
freebsd.submit.mc

divert(0)dnl
VERSIONID(`$Id: submit.mc,v 8.6 2002/03/26 03:30:58 ca Exp $')
define(`confCF_VERSION', `Submit')dnl
define(`__OSTYPE__',`')dnl dirty hack to keep proto.m4 from complaining
define(`_USE_DECNET_SYNTAX_', `1')dnl support DECnet
define(`confTIME_ZONE', `USE_TZ')dnl
MASQUERADE_AS(`optexstaging.com')dnl
FEATURE(`msp', `[127.0.0.1]')dnl
dnl FEATURE(`msp')dnl

and optex.mc;

divert(0)
VERSIONID(`$FreeBSD: src/etc/sendmail/freebsd.mc,v 1.10.2.8 2001/03/06 02:12:59
 gshapiro Exp $')
OSTYPE(bsd4.4)
DOMAIN(generic)
FEATURE(access_db, `hash -o /etc/mail/access')
FEATURE(blacklist_recipients)
FEATURE(local_lmtp)
FEATURE(mailertable, `hash -o /etc/mail/mailertable')
FEATURE(relay_based_on_MX)
FEATURE(virtusertable, `hash -o /etc/mail/virtusertable')
define(`confCW_FILE', `-o /etc/mail/local-host-names')
define(`confMAX_MIME_HEADER_LENGTH', `256/128')
define(`confNO_RCPT_ACTION', `add-to-undisclosed')
define(`confPRIVACY_FLAGS', `authwarnings,noexpn,novrfy')
MAILER(local)
MAILER(smtp)