In AB Bulk Mailer you can add multiple gmail and yahoo accounts to send mails. This means that the senders in the form of gmail,yahoo, msn etc accounts are used to send mails and are added to the software only once. To send million mails per day free all you need to create accounts in different servers and add them to the software. Yo can check AB Bulk Mailer tutorial to check things in detail.You can also you-can-track your bulk-mailing response,grab contacts from google and use any free smtp server as well as paid smt servers. For any smtp server permit you need to check laws of your country.
Latest version 9.3 is better. Can be downloaded from abbulkmailer.com. Full manual is given at http://abbulkmailer.com/ab-bulk-mailer.
AB Bulk Mailer contains powerfull email extractor software, and is #1 mail sender for targetted marketing.You do need paying email marketing agencies for email marketing as you can directly use email senderand send mails to your mailing list directly. Also trynever send all your bulk emails all at once as it effects inbox rate.