sendmail & name resolution problem

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Hello,
with your help, I finally setup my RH7 linux box onto
a large WinNT LAN. They just give me a dynamic IP
address.
Now I can ping and connect by name the WinNT computers
and they can also do the same thing to my computer
(samba & nss_wins).
I wrote a simple C program that hack the IP address
and put it into my /etc/hosts file every time the
computer reboots. I don't know if this thing help
somehow.
I can send e-mail from my computer to everywhere in
the company domain (romtelecom.ro) but I cannot
receive e-mail fom that domain. Is there any trick to
setup sendmail or something else in order to send and
receive e-mail outside the company domain?
Maybe I can use the company mail server as a relay.!!
???
These are some maillog lines:
Jan 19 01:51:55 deltacom sendmail[1275]: f0INoiC01273:
to=<tatia@alpha1.infim.ro>,
ctladdr=<root@deltacom.romtelecom.ro> (0/0),
delay=00:01:10, xdelay=00:01:10, mailer=esmtp,
pri=30277, relay=alpha1.infim.ro. [193.231.44.2],
dsn=4.0.0, stat=Deferred: Connection timed out with
alpha1.infim.ro.

Jan 19 01:52:15 deltacom sendmail[1282]: f0INqFV01282:
from=<root@deltacom.romtelecom.ro>, size=280, class=0,
nrcpts=1,
msgid=<Pine.LNX.4.21.0101190151560.1280-100000@deltacom.romtelecom.ro>,
proto=ESMTP, relay=root@localhost

Jan 19 01:52:22 deltacom sendmail[1284]: f0INqFV01282:
to=<dutuluminita@romtelecom.ro>,
ctladdr=<root@deltacom.romtelecom.ro> (0/0),
delay=00:00:07, xdelay=00:00:07, mailer=esmtp,
pri=30280, relay=mail_it1.romtelecom.ro. [172.30.1.3],
dsn=2.0.0, stat=Sent (OK)

Jan 19 01:52:31 deltacom sendmail[1279]: f0INpHX01277:
to=<probit@kronos.ipa.ro>,
ctladdr=<root@deltacom.romtelecom.ro> (0/0),
delay=00:01:13, xdelay=00:01:13, mailer=esmtp,
pri=30274, relay=kronos.ipa.ro. [193.230.72.2],
dsn=4.0.0, stat=Deferred: Connection timed out with
kronos.ipa.ro.

Jan 19 02:14:23 deltacom sendmail[1288]: f0J0EN901288:
from=<root@deltacom.romtelecom.ro>, size=277, class=0,
nrcpts=1,
msgid=<Pine.LNX.4.21.0101190214001.1286-100000@deltacom.romtelecom.ro>,
proto=ESMTP, relay=root@localhost

Jan 19 02:14:29 deltacom sendmail[1290]: f0J0EN901288:
to=<costindan@romtelecom.ro>,
ctladdr=<root@deltacom.romtelecom.ro> (0/0),
delay=00:00:06, xdelay=00:00:06, mailer=esmtp,
pri=30277, relay=mail_it1.romtelecom.ro. [172.30.1.3],
dsn=2.0.0, stat=Sent (OK)

TIA

=====
Eng. Bubulac Angela Tatiana
IT Department, Romtelecom 
Phone: 4002804

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