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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]