"Authentication failed" when third party smtp server is used

Hello, I am using action mailer to send mails. I need to use a third party smtp server. The third party smtp server i am using is authsmtp.

    ActionMailer::Base.smtp_settings = {     :address => "mail.authsmtp.com",     :domain => "mydomain.com",     :port => 2525,     :authentication => "login",     :user_name => "promo@mydomain.com",     :password => "password for promo@mydomain.com" }

when i try to send the mail, i get authentication failed error. but if i change the :address to mail.mydomain.com everything works fine. I want to use authsmtp to send mail

I think i also have to authenticate the authsmtp server.I have its username and password. Where do i have to write that.

Any idea whats going wrong. Please help Thank you.

when i try to send the mail, i get authentication failed error. but if i change the :address to mail.mydomain.com everything works fine. I want to use authsmtp to send mail

I think i also have to authenticate the authsmtp server.I have its username and password. Where do i have to write that.

You should be using that username and password in your smtp settings.

Fred