I'm using SendBlaster to send my newsletter (thousands of recipients). The problem is that I use around 20 SMTP servers (free email accounts created), and it's cumbersome.
Do you know an application that allows to send mails using several SMTP servers, but that distributes the load evenly across the servers? Also with rules, e.g. send only 100 emails/hour per SMTP server not to be blacklisted. On SendBlaster, it is all manual and not convenient at all.