title: SMTP permanent error: 550 5.7.1 Unable to relay
body: <p>Can someone please solve this error:</p>
  
  <pre><code>create or replace procedure email
  as
  begin
  utl_mail.send(sender =&gt; 'abc@gmail.com',
  recipients =&gt; 'xyz@gmail.com',
  subject    =&gt; 'Test utl_mail.send procedure',
  message    =&gt; 'test!');
  end;
  /
  </code></pre>
  
  <p>Procedure created.</p>
  
  <pre><code>execute email;
  BEGIN email; END;
  
  *
  ERROR at line 1:
  ORA-29279: SMTP permanent error: 550 5.7.1 Unable to relay
  ORA-06512: at "SYS.UTL_SMTP", line 21
  ORA-06512: at "SYS.UTL_SMTP", line 99
  ORA-06512: at "SYS.UTL_SMTP", line 241
  ORA-06512: at "SYS.UTL_MAIL", line 424
  ORA-06512: at "SYS.UTL_MAIL", line 594
  ORA-06512: at "SYS.EMAIL", line 4
  ORA-06512: at line 1
  </code></pre>
  
  <p>I have configured database with utl_mail previously.</p>