There is a lot of great content here though I worry some of it is quickly becoming outdated. Every three months google has been updating their spam filters and making it harder and harder deliver sales emails at scale.

As evidence of this, look at Rift.com a YC/Sequoia-backed sales email tool that closely followed this same playbook but was forced to kill their service as Google made it increasingly difficult to deliver sales messages at scale.

Conversion rates use to be 1-10% from email to meeting booking. Now I believe most teams are seeing significantly below 1%.