Extract lines from file, add to new files

[Rich Shepard]

On Mon, 29 Jan 2024, Thomas Passin via Python-list wrote:

> If you aren't going to use one or another existing template system,
> perhaps the easiest is to use unique strings in the message file. For
> example:
>
> Dear __##so-and-so##__:
>   Please don't write this message off as mere spam.
>   Respectfully, Rich
>
> Then you just do a replace of the unique string by the salutation. Don't
> change the original (i.e., template), make the changes to a copy that you
> will output.

My script is not a web application, but an emailer that allows me to contact
clients and prospective clients. From the command line on a linux host.
Using the python smtplib and mail modules.

Rich