Clint Lalonde Also wrote about the use of MailPoet To curate his newsletter. It doesn’t suit me at this point in time, but might suit you. Also, I think MailChimp allows you to collate via blog posts too? I assume that is what @dajbelshaw is doing with Thought Shrapnel.
This is a generally brilliant set up for any researcher, professor, journalist, or other stripe of writer for providing online content, particularly when they may be writing for a multitude of outlets.