I'm creating a content type specifically for email newsletters, which will be sent using phplist (client prefers phplist to using a Drupal newsletter module such as Simplenews).
So I'm planning to use a module like ThemeKey or Content Theme to create a new theme specifically for newsletter content type. Like most newsletter templates, the theme will use tables and lots of inline CSS.
I haven't seen any Drupal base themes for newsletters. Before I build from scratch, is there any advice or suggested theme/module I might have overlooked?