Use entry's modification or publication date in email Date header.
It allows to sort messages chronologically, no matter when feeds are added or fetched.
Prepend feed title or author's name to From: email header.
It allows to distiguish posts from different sources in the same IMAP folder.
Given {:from "rss@bot.com"} in urls.clj, most messages will appear as either
From: Some Blog http://someblog.com/ <rss@bot.com>
Subject: Post Title
Date: [publication date]
...
or
From: First Author, Second Author <rss@bot.com>
Subject: Post Title
Date: [publication date]
...
Given
{:from "rss@bot.com"}inurls.clj, most messages will appear as either