🚀 go-pugleaf

Please tell me either how to set up a Eudora like application that would
allow me to compile a large list of email addresses and then send out a
mass mailing to them all at once.  I want to be able to add addresses to
the list with ease.  I am familiar with making a nickname to represent all
of the addresses but I need database capabilities also in the program for
easy changes.  In short, I would like the best program to construct a large
mailing list of email addresses.  Maybe you could send me the address of
the guy who designed Eudora?  Any help or sense of direction would be
appreciated.
Thanks,
Brennan