Yes,
Configure the postoffice functionality on the IOS Router.
Refer to the IOS Firewall user's guide.
Then add the IOS Router to CSPM as a postoffice host:
I've never done it, but this section of the CSPM guide shoudl explain how to add the IOS Router to CSPM as a postoffice host:
http://www.cisco.com/univercd/cc/td/doc/product/ismg/policy/ver23i/idsguide/ch04.htm#xtocid2665211