Hello,
I am build to sent email with around 5000 email at time sent means Multiple emails used.Like Gmail but at the end Gmail have restriction for limited user.also not sent in SPAM .do you suggest me if any Web service provide this facality.[Not sure but Mailchimp could be provide this all or any others]

Thank You.

MailChimp or ConstantContact. I've used both and slightly prefer MailChimp. Both have good APIs available too.

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