SERVER WITH A VARIABLE IP FOR SENDING MASS E-MAILS -- 2

I am looking for a server with a variable IP for sending mass e-mails, with the function of resending unopened emails included. The level of automation required is simple operations. The server is not specified (shared host, VPS, or dedicated server; as this question was skipped). If you can provide this service and feel capable of meeting the above requirements, please contact me to discuss further. Thank you.