It looks like I should do this in the user.cfg.php, but it doesn't work if I put 586 or 465 in there instead of 25.
Also not when I use ssl with username password.

No it should be done on the php.ini file.

Yes, I've found it, it works! I hope it works for all providers. These are the changes in user.cfg.php

// Linda: I changed 'localhost' to 'smtp'
$user_config['mailer']['service'] = 'smtp';

// Does the remote SMTP server need authentication?
// Linda: no changes
$user_config['mailer']['smtp']['auth'] = true;

// Use this if the server needs authentication:
// Linda: I entered my own email
$user_config['mailer']['smtp']['user'] = 'mail@server.com';
// Linda: I entered my own password
$user_config['mailer']['smtp']['password'] = 'password';

// The address of the server
// Linda: I entered my own domain
$user_config['mailer']['smtp']['host'] = 'mail.server.com';

// Connection parameters for a plain SMTP server
$user_config['mailer']['smtp']['port'] = '25';
// LINDA: I changed this from '' to 'true'
$user_config['mailer']['smtp']['secure'] = 'true';

Cool thanks for figuring that part out.

This fixed it for me aswell..Thanks!!