Take a look your administration page. Now you can see navigation, some information about MailRock mailer with links and list of the queues (empty).
All this fields required for identify sender in message headers "From: My Company
Your company or full name, recipients should see from who they're got letter. By default this information loading from your configuration, but you can change it.
Your company or personal email. By default this information loading from your configuration, but you can change it.
Simply enter letter subject here.
Here is content of whole message. You can write plain text or rich-text with HTML tags.
For each message you can add one or more attachment.
— More Attachments
You can add more attachments by clicking on [+] button.
MailRock not yet have store to keep all contacts in contact list, so each time you composing newsletter or mailing list, you should add list of e-mails in plain form.