Are you referencing to the smtp_out_server parameter in the init.ora?Do I have to setup another smtp server software and set the the ip address of my computer as the value of smtp_out_server parameter or just set the ip address of another smtp server? ----- Original Message ----- From: Stefan Knecht To: xiaoyezi.xyz@xxxxxxx Cc: oracle-l@xxxxxxxxxxxxx Sent: Thursday, July 27, 2006 7:02 PM Subject: Re: ORA-29278: SMTP transient error: 421 Service not available Try to set smtp_out_server parameter to a valid smtp server Stefan On 7/27/06, xiaoyan <xiaoyezi.xyz@xxxxxxx > wrote: Hi,all When I try to use UTL_SMTP package to send mail,I got the following error: ORA-29278: SMTP transient error: 421 Service not available ORA-06512: at "SYS.UTL_SMTP", line 21 ORA-06512: at "SYS.UTL_SMTP", line 97 ORA-06512: at "SYS.UTL_SMTP", line 139 ORA-06512: at "SEC_SYSTEM.DEMO_MAIL", line 240 ORA-06512: at "SEC_SYSTEM.DEMO_MAIL", line 118 ORA-06512: at "SEC_SYSTEM.DEMO_MAIL", line 104 ORA-06512: at "SEC_SYSTEM.MAILTEST", line 3 ORA-06512: at line 2 Then,where is the problem? Thank you in advance!