You might be able to do it with Outlook.
Just create a distribution list of your recipients.
You can hide names and addresses in a personal distribution list
Outlook for Office 365 Outlook 2019 Outlook 2016 Outlook 2013 Outlook 2010.
To so so and keep the names and e-mail addresses of people included on a personal distribution list private, or hidden, use the Bcc field.
In an open message, add your e-mail address in the To box.
In the Bcc box, add the distribution list.
Type your message and click Send.
For information about creating a contact group or distribution list, go to Create a contact group or distribution list in Outlook.