[ossec-list] not get email alerts

[jagruti sangani]

hello all
I have installed the ossec as per steps given in the document.But now i got 
the error in ossec.log like* ossec-maild(1223): ERROR: Error Sending email 
to 192.168.1.23 (smtp server)*.I have given my email_to as 
jagruti.sang...@inextrix.com and email_from is on of the gmail support.and 
i have given smtp server as 192.168.1.23.So how can i get the notification 
in my emailid and when i will got this message.