To send PERSONALIZED Mail Messages

I have my customers details like follow in a TXT document: Name Company E-mail Customer name2 Customer company2 Customer E-mail2 Customer name3 Customer company3 Customer E-mail3 I need a program that takes the data am put's in my message body in certain points determined by me. The whole ideea is to send personalized messages to my customers. Like This: ======== Dear Your company has been awarded with a free $20 cupon. The coupon can be used until....... This e-mail was sent to the soft needs to send the message to this mail / no mistakes Thank you ============ Message body will not be the same, so I need a key word for each field (name, company. e-mail). Where I put that key word the soft needs to replace it with (name, company, e-mail) I need to have editable: SMTP, SERVER (host, port, user name, passwors, ssl, tlc), Sender from mail, Sender from name Subiect Message Body will be HTML I need to be able to update / replace my customer list at any time The soft have to detect any duplicate e-mail in the TXT file and send the message only once.