Tested on Fedora 39

1. Install swaks

   sudo dnf -y install swaks

2. Create a text file with the email address of every recipient – one email address per line. Name the file list.txt
3. Create a html file that is your email. Name the file message.html. Put all images on a publicly accessible web server
4. Create the following bash script – name it sendmail.sh

   #!/bin/bash
   for fn in `cat list.txt` ; do
             swaks --to $fn --from partyanimal@mydomain.net --header "Subject: Wild Party Tonight" --attach-type text/html --attach-body @message.html --server mailserver.mydomain.net
   done

5. execute

   chmod 755 sendmail.sh

6. execute

   ./sendmail.sh

7. Have fun at the party!!!