Are you trying to send email outside your network? We had some problems (CRLF line seperator) when we were sending emails outside our network (say to a Yahoo email account). We are using OEM 22.214.171.124.0. We applied Patch:2510196 CONSOLIDATION BUG FOR 9.2 OMS PATCH SET #2. This did not fix the problem. Make sure packages owned by OEM_9I are valid. Finally Oracle filed a Bug (#2754796) with development group and then after applying patch 2268674 we are able to send emails outside our network (inside the network it was working fine before).
Also look at following documents on metalink:
Doc ID: Note:74269.1
Doc ID: 198162.1
OCP DBA (8,8i,9i)
"Let's document it and call it a feature."