Redmine

Hi Guys I'm really new in this, redmine was installed on an old g5 tiger mac and works fine with emails but its disk fails and I need to change to another one, this new one has leopard server and download bitnami stack 0.9.2 and works fine but when i try to send test email fails with the message An error occurred while sending mail (530 5.7.0 Must issue a STARTTLS command first. 20sm1927268ywh.48 ) my email.yml seems to be ok with all forums that i've visited but something is missing, can anyone help me to resolve this, thank for any advice, greetings