How to send email from APEX?

Command to Send EMail:

DECLARE
 l_id number;
BEGIN
    l_id := APEX_MAIL.SEND (p_to        => 'srm.jay@gmail.edu',  
                            p_from      => 'srm.jay@stanford.edu',  
                            p_subj      => 'APEX_MAIL from imguat',
                            p_body      => 'Please review the attachment.',
                            p_body_html => '<b>Please</b> review the attachment');    
COMMIT;
END;
/

To send a mail immediately from the apex mail queue:

Oracle Application Express logs successfully submitted message in the table APEX_MAIL_LOG with the timestamp reflecting your server's local time. 

begin
APEX_MAIL.PUSH_QUEUE('localhost','25');
end;
/

Please check the apex_mail_log table for any errors or warnings.

select mail_send_error from APEX_MAIL_LOG ;