For example I have Email Delivery Engine and it's a powerful group mailer which sends your message directly from your PC to the recipient's mail server without using any ISP's relay SMTP server. Any ISP provider has the restrictions on number of sending emails and E-Delivery Engine solves all these problems. It gives instant confirmation of delivery by checking the address before it sent, which at 80% eliminates "Mail undeliverable" messages you can get.
And can anyone explain me how do such programms work? How do they work withou ISP?
And can anyone explain me how do such programms work? How do they work withou ISP?