While sending mail using UTL_SMTP, it is throwing below error.

Our product is oracle database EE 19.15 on linux OLVM 8.

We are trying to send mail using UTL_SMTP using sendgrid API key, but we struck with below error. The same is working using telnet.

ORA-29279: SMTP permanent error: 535 Authentication failed: The provided

authorization grant is invalid, expired, or revoked

ORA-06512: at "SYS.UTL_SMTP", line 57

ORA-06512: at "SYS.UTL_SMTP", line 142

ORA-06512: at "SYS.UTL_SMTP", line 223

ORA-06512: at line 16

Please find the code used to send mail.

DECLARE

c utl_smtp.connection;

v_username varchar2(100) := 'apikey';

v_password varchar2(500) := '***********';

BEGIN

c := utl_smtp.open_connection(host => 'smtp.sendgrid.net',