Using Blind copy with a mailing list


New Email
This is what I am trying to achieve:

I manage the web page and email list for the Cape Computer & Technology Club

There are 90 names in the mailing, which is named "c3po"

When sending a mail, the "To" is the club's email address. I would like to send blind copies to all 90 people on the list

When clicking on Bcc, it shows me the list, but I cannot choose All the people on the list, I have to go down an click all 90 individually

How can I choose all 90 to be added to the Bcc?

Thank you