I've entered competitions that were global, and involved bigger numbers, but still get an email notifying whether a loss or win.
Even Disney send you emails telling you lost.... It's basic database search result n mail merge, takes about 5 mins to set up (time taken to automate the merge, depends on numbers n servers). It is stuff I was doing in the 90s with word (letters back then) and even early naughties with email, the process was the same (obvs sending large numbers of emails took a while, as speed wasn't great back then).
If people need training, i don't mind if you pay me to come over n teach!