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Pl post OS details and exact versions of "10g" and "11g" - were all of the post-upgrade steps completed ?
Pl see these MOS Docs
How To Verify Current ACL Settings For Network Resources [ID 1364026.1]
Ora-24247: Network Access Denied By Access Control List (Acl) Using localhost as SMTP Server Name [ID 1348855.1]
FAQ and Known Issues While Using UTL_SMTP and UTL_MAIL [ID 730746.1]
I had this same problem and you can find some notes here about the [url http://www.ora00600.com/scripts/11g/UTL_SMTP_ORA-06512.html]ORA-24247: network access denied by access control list (ACL) and how to solve it.
Hope that helps,