Mailscanner ignores "MCP Checks = no"

[Ramprasad]

I am running Mailscanner 4.50  on centos.
In my Mailscanner.conf I have MCP Checks = no 
yes when I start logging time I can see in my maillog lines like these 

---------

Apr 20 12:38:50 rs4 MailScanner[3599]: MCP Checks completed at 464021787
bytes per second
Apr 20 12:38:54 rs4 MailScanner[3560]: Spam Checks completed at 2449
bytes per second
Apr 20 12:38:59 rs4 MailScanner[3560]: Virus Scanning completed at
233986 bytes per second
Apr 20 12:39:0

---------------

Are MCP checks happening after all ? 

Thanks
Ram