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is this an attack on my sendmail?

hi guys in my maillog I am receiving many strange message on sendmail like 
May 10 18:52:50 xserver sendmail[4444]: g4AIRfa02119: 
to=<yourname@company.com.>, ctladdr=<one of my user mail> (638/45), 
delay=03:25:09, xdelay=00:00:00, mailer=esmtp, pri=607606, 
relay=company.com., dsn=4.0.0, stat=Deferred: Connection timed out with 

look that <one of my user mail> is one registred email with my domain. The 
messages points aways to the same user email.

and the other strange thing is that when i try to check the 
conections(netstat -at) there are one strange like that:
tcp        0      1 myserver:35169           mywebos.com:smtp        SYN_SENT
when I use netstat -atn looks like that:
tcp        0      1 myserver:35169       SYN_SENT

and look that this ip( is not owned by mywebos.com

I think it is spoofed 

In my network, I have one DMZ which this server was placed.
I am using one linux firewall(iptables) to redirect the packages to my DMZ
But I think if this is an attack it is comming from my LAN which have 
directed access to my DMZ.

Maybe this is an attack?
What i can do?
Any specials rules to protect me with iptables?
How I can find the source of the attack?


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