Strip dealing with contemporary issues and religion.
A fairly common (and annoying) problem which seems to like to popup after migrations, yet not unsolvable.
Running for over a year is a pretty good chunk of webcomic history; running for 10 years means you've been around for most of it.
Naturally, webcomics this old are a prime source of Archive Panic, so beware.
This should resolve the issue with users not showing up in Outlook when in cached mode.