Sending email to 10,000 addresses without knowing Host and Protocols!!

Context:
I am building an "eMail Marketing Campaign" application which takes a list of email addresses (unlimited) and sends an eMail to all of them.
My servlet creates an instance of "MyMailHandler.java/class" and passes a list of addresses.
Problem:
If I want to send email to different user, do I need to know about everyOne's HOST and PROTOCOL. My application recieves list of addresses from a remote server of a data-selling-company so they don't have that info.
Following is the code (hardCode!) of MyMailHandler.
properties.put("mail.smtp.host", "MAIL.DMCDATABASE.COM");
properties.put("mail.transport.protocol", "IMAP");
Question:
How do I send emails to receivers without knowing everyOne's host and Protocol?????? (new to JavaMail)

No, you only need to know the name of your own mail host. It will send the e-mails to those 10,000 addresses for you. And the protocol for sending mail is SMTP, that's all you need to know to send mail. IMAP and POP are protocols for storing received mail messages and so are not relevant to your task.

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