The next step is to specify the group of recipients of your bulk mail, set the sender name and address and to enter the message subject and body.
Please note that an automatic line break is at 78 characters (this is standard for most e-mail clients and servers). If you want to send a document like a PDF file to the recipients, please put that file on your website and send them the link to that file. (Attaching documents to bulk e-mails can cause significant network traffic as the file is sent to each recipient separately and it can trigger spam filters.)
Below the message text area you find a selection of "codes" like {dear_fullname} that can be used in the bulk e-mail and that are replaced by data according to the recipient of the mail, e.g. his name, the title of his submission or the results of the review process.