My boss want to send bulk email to over a thousand recipient that he has in an excel spreadsheet through her zimbra desktop. These recipients are not part of the GAL. What is the easiest way to send the email without each recipient seeing the email addresses of the other recipient.

1) Is this possible, if so, how do I go about sending an email from a list of email addresses in an excel spreadsheet

2) Will it be possible for recipient not to see email addresses of other recipients.