Email Bugs
repositoryA repository for documenting bugs in webmails and email applications.
Code
Hacks & Bugs
Repositories and write-ups documenting rendering bugs and the CSS hacks that fix them.
5 resources
ESPs HTML bugs
repositoryA repository for documenting ESPs HTML interpretation bugs and oddities.
A walkthrough by Stig Morten Myre on different techniques you can use to fix Outlook bugs.
How to Target Email Clients
websiteCrowdsourced email development techniques for singling out email clients and platforms.
A deep dive into Outlook's rendering engine and a look at ways to tame the beasts that are the Windows versions of Outlook.