Hello there, I'm experienced bot developer and I can write a software (PHP/C#/C++/Python) that can be run locally or placed on a server, mine or yours (awesome server costs 5$ monthly, which I can setup for you) and constantly fetch new pages.
It will be multithreaded, and what it means is that it will work in parallel, thus downloading the emails very fast, and saves to database,Excel or similar
If you want an example of one of my projects, I can show you a cool one. Lets have a chat.
Thank you,
Borna