The chart above shows " a standard email mailers which most of us receive on a daily basis. Emailers which are sent to their users if they have 1) either subscribed for a newsletter, Alerts, Notifications on something which you have opted in, ( This also includes payment receipts, invitations,
Transactional Email Service :Transnational email is an expected email because it has been triggered automatically after a transaction or a specific event. Common examples of transnational email is : account opening and welcome message, order shipment confirmation, shipment tracking and purchase order status, registration via a contact form, account termination, payment confirmation, eCommerce purchase and many more.
Bulk Emailers are used by publishers and this can be sent to a third party which sends you a have opted for such a service . Examples include a " Newsletter which offer a coupon or a gift card which you can redeem ( at a store , a Holiday sales discounts, etc)
The basic difference is that while B2c users are transnational and sent for a service which you requested at some time by consumers
These services help you to send these emails without having to configure and manage mail servers, ensuring you to have state of the art configuration to ensure email deliverability. Your application can usually use SMTP protocol using their SMTP Relay, or use a specificAPI.
While Bulk Emailers are meant for most often that for business or lead generation . These emailers are normaly send as a promotional offer, for a third party. However the veracity of these emailers cannot be ensured, as it migh land up in the junk box, or the email service provider might not recognize the message