I'd like to have an S M T P server which is fast, cheap, and reliable.
Before paying, I must test the server, and confirm it working with the sender software. I already have high-quality email sending software, and huge email lists.
So, in conclusion, all I need is the S M T P server, it must be have capacity to send around 50,000 emails per hour. I will read and think about alternative ways. Serious bidders only please.
Also, emails sent via the S M T P server, must reach inbox.