Dear All I try to send an email when n alarm happens but i can not setup the emai account settings

in the send server box i put

smtp.mail.yahoo.gr

on port tried putting the first time 465 and the second 587 but with no succes

i put my user name autodafos@yahoo.gr

and my password

but when i press the send button for testing I always receive a fail message

I also went to my yahoo acccount and in the security settings i changed the option to allow less secure apps to send emails in case that was the problem.

What should i do more or what am i doing wrong and i can  not send emails?

thank you in advance for your help