app/config/config.yml
        # Swiftmailer Configuration
    swiftmailer:
        transport: smtp
        host:      smtp1.servage.net
        auth_mode: login
        username: webmaster@myEmailAtServage.com
        password: mypassword
        port : 25

The mail server smtp2.servage.net has support for TLS and SSL, using standard SSL port 465

# Swiftmailer Configuration
swiftmailer:
    transport: %mailer_transport%
    host:      %mailer_host%
username:  %mailer_user%
    password:  %mailer_password%
    port : %mailer_port%
    encryption: ssl
    auth_mode:  login

mailer_transport="smtp"
    mailer_host="smtp2.servage.net"
    mailer_user="me@mywebsite.com"
    mailer_password="myPassword"
    mailer_port=465

#app/config/config.yml
swiftmailer:
    transport: "%mailer_transport%"
    host: "%mailer_host%"
    username: "%mailer_user%"
    password: "%mailer_password%"
    port: "%mailer_port%"
    encryption: ssl
    auth_mode:  login
    spool: { type: memory }
fos_user:
db_driver: orm
firewall_name: main
user_class: ControlEficienciaEnergeticaControlEficienciaBundleEntityUser
registration:
    confirmation:
        enabled: true
        from_email:
            address: user@uo.edu.cu
            sender_name: SCRE

service:
    mailer: fos_user.mailer.twig_swift
resetting:
    email:
        template: email/password_resetting.email.twig#//app/Resources/email

#app/config/parameters.yml
mailer_transport: smtp
mailer_host: 10.30.1.127
mailer_user: user@uo.edu.cu
mailer_password: mypassword
mailer_port: 465