Email on dreamhost

Greetings fellow djangonauts
My Django app is working nicely on dreamhost.  
When I use gmail for code error notifications or send_mail, everything works fine.
When I use my dreamhost email, I am able to send emails from my app using send_mail but i no longer receive code error notifications.
I checked with dreamhost, they said my email settings were correct and that it must be an app issue.  Is there some additional admin setting that I'm missing?
Any help would be highly appreciated.

Here are my settings :

GMAIL SETTINGS:  #works great
     EMAIL_HOST = 'smtp.gmail.com'
     EMAIL_PORT = 587
     EMAIL_HOST_PASSWORD = 'PASSWORD'
     EMAIL_HOST_USER = 'my_username'
     EMAIL_SUBJECT_PREFIX = ''
     EMAIL_USE_TLS = True

DREAMHOST SETTINGS:
    EMAIL_HOST = 'mail.my_site.com'  #also tried 'localhost'
    EMAIL_PORT = 587  #also tried 25...
    EMAIL_HOST_PASSWORD = 'PASSWORD'
    EMAIL_HOST_USER = 'admin@my_site.com'
    EMAIL_SUBJECT_PREFIX = ''
    EMAIL_USE_TLS = True  #i tried with and without TLS, it does not work.

Thanks,

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