ActionMailer SMTPSyntaxError 503

I am having a little difficulty getting actionmailer to work. It was
actually working great for a couple months, but stopped recently (maybe
when I added another domain to my DNS?). I originally left the server
settings at their default. When it stopped working (giving me 505 -
sorry, no mailbox here by that name), I added this to my settings:

:domain => “”,
:authentication => :login,
:user_name => “[email protected]”,
:password => “(password)”

and now I get this error:

Net::SMTPSyntaxError in StoreController#create_customer

503 you are already authenticated

any ideas?

Matt R. wrote:

any ideas?

Now I’m thinking it’s possible my application broke when I updated to
Rails 1.1.6. Is there an easy way to roll back my rails gem and check
this out?