The restriction which many companies are facing in mass mailing is that they want the emails to be sent from a single domain or via its subdomain. Hence the limitation by the SMTP relays which force the companies to approach mass mail solution providers like mailchimp and ConstantContact.
Now what if I have to sent mass mail to almost 1 million id's and I am not limited by that above factor of sending from a single domain? For me the emails has to see the inbox of those 1 million id'and I am at the liberty to use any number of domains. Is there a solution which somebody could suggest and its cost effectiveness.
A solution will be appreciated.