EXM 
List Manager: Contact Lists vs. Segment Lists
#25DaysOfEXM: Day 15
List Manager: Contact Lists vs. Segment Lists
Email Variants: Content Testing Emails in EXM
#25DaysOfEXM: Day 13
Email Variants: Content Testing Emails in EXM
Creating A Custom Email Template: Part 3
#25DaysOfEXM: Day 11
Creating A Custom Email Template: Part 3
Adding the Email Template to Message Types
Creating A Custom Email Template: Part 2
#25DaysOfEXM: Day 10
Creating A Custom Email Template: Part 2
Creating A Custom Email Template: Part 1
#25DaysOfEXM: Day 9
Creating A Custom Email Template: Part 1
The Branch Template and Message Root
Sending Your First Email: Part 4
#25DaysOfEXM: Day 8
Sending Your First Email: Part 4
Delivery Options and Dispatch
Sitecore Hacker 