ORA-29279: SMTP permanent error: 501 5.5.4 Invalid Address

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 Hi All,

i am using oracle 10g version 10.2.0.4 on linux  i make a script for sending emails which was generated using database utility utl_smpt or utl_mail for password change activity 

this script was running fine in my previous company but in my new company i have configured this emails these emails was working fine but after exit that session and again connect and run this script the script show me an error  "ORA-29279: SMTP permanent error: 501 5.5.4 Invalid Address" i have searched this error and google but resolution not found 

i first run 

@D:\oracle\product\10.2.0\client_1\RDBMS\ADMIN\utlmail.sql;