In Example 3 the to and from are backwards:
C:\PS>send-mailmessage -to "User01 <user01@example.com>" -from "ITGroup <itdept@example.com>" -cc "User02 <user02@example.com>" -bcc "ITMgr <itmgr@example.com>" -subject "Don't forget today's meeting!" -credential domain01\admin01 -useSSL
The correct code would be:
C:\PS>send-mailmessage -from "User01 <user01@example.com>" -to "ITGroup <itdept@example.com>" -cc "User02 <user02@example.com>" -bcc "ITMgr <itmgr@example.com>" -subject "Don't forget today's meeting!" -credential domain01\admin01 -useSSL