Why it works
The human brain hates ambiguity and seeks clear, definitive answers to reduce mental tension. Providing a simple yes-or-no question helps the prospect resolve the uncertainty of the email quickly.
Example
Are you currently happy with your document automation workflow, or are you looking to improve it?
An illustration of the mechanism, not a template. Copied verbatim it stops being persuasion and starts being the pattern everyone else is already sending.
Is your sequence pulling this one?
Paste it in and find out which levers are working, which are missing, and which single zero is capping the whole message.