49038 SMTP Send

I posted a project yesterday about remote mailing but i beleive SMTP mailing is where i want to go with this . Need a script that allows me to send mail SMTP with the following options. Ability to change SMTP servers on fly. Ability to set headers. Ability to attatch files Ability to set attatched file MIME types. Receives respons BACK from server.. "receipt" I have 10 servers that i wish to use as SMTP boxes going to send about 1 mil messages a month... TEXT ONLY messages. Please do not bid if you cannot complete with in the time or the budget.. contact via phone, aim , msn , yahoo.