SMTP Mail Check to identify its triggering Mail or not :

There are 2 methods we can check SMTP.

1.Run the below procedure from SQL Prompt 

DECLARE

  v_From      VARCHAR2(80) := 'test@abc.com';

  v_Recipient VARCHAR2(80) := 'user@abc.com';

  v_Subject   VARCHAR2(80) := 'test subject';

  v_Mail_Host VARCHAR2(30) := '**.**.**.**';  --(SMTP MAIL SERVER IP)

  v_Mail_Conn utl_smtp.Connection;

  crlf        VARCHAR2(2)  := chr(13)||chr(10);

BEGIN

v_Mail_Conn := utl_smtp.Open_Connection(v_Mail_Host, 25);

utl_smtp.Helo(v_Mail_Conn, v_Mail_Host);

utl_smtp.Mail(v_Mail_Conn, v_From);

utl_smtp.Rcpt(v_Mail_Conn, v_Recipient);

utl_smtp.Data(v_Mail_Conn,

   'Date: '   || to_char(sysdate, 'Dy, DD Mon YYYY hh24:mi:ss') || crlf ||

   'From: '   || v_From || crlf ||

   'Subject: '|| v_Subject || crlf ||

   'To: '     || v_Recipient || crlf ||

   crlf ||

   'some message text'|| crlf ||      -- Message body

   'more message text'|| crlf

);

utl_smtp.Quit(v_mail_conn);

EXCEPTION

WHEN utl_smtp.Transient_Error OR utl_smtp.Permanent_Error then

   raise_application_error(-20000, 'Unable to send mail: '||sqlerrm);

END;

2. Below method using telnet

telnet **.**.**.***  **                               -- ( telnet IP port)

EHLO ***.**.7.16                    ( Server IP)

MAIL FROM: test@abc.com

RCPT TO: user@abc.com

DATA

Test mail.