Own domain login not log?

[Ishukor]

Hi,

I just notice that when a sender from user at mydomain.com send to 
anotheruser at mydomain.com it is not log to my /var/log/maillog, so my 
mailwatch does not show any logging from user in the same domain is it 
normal or do I need to set anything so I can log all activities? I am 
using MailScanner version 4.49 with postfix as a gateway relay for my 
exchange.

Thanks in Adavance.