[twitter-dev] Do My Customers Have a Twitter Account?

[arawajy]

Dear Developers,
I have a list of 400,000 e-mail addresses of my clients. I want to
know "Is it possible to develop a script to check if they have a
twitter account or not?". I will then want to generate 2 separate
lists based upon the result; one for the twitter users and one for the
non-twitter users. I want to only invite the users and create a custom
invitation message. Is it possible to check if the e-mail address's
owner is a twitter user or not? provide details please.
Thanks and Regards,
Mahmoud