Olá Sandra,
Por favor, verifique as notas:
1791636 - mail sending issue via SMTP required SSL
1492292 - SBO Mailer doesn't work in Login Authentication mode
http://scn.sap.com/thread/3309701
http://scn.sap.com/thread/1467684
http://scn.sap.com/message/9212198
Abraço,
Marcelo Silva Santos