Boomerang looked at more than 40 million emails to find out how long the best email should be to get the most responses.
Here’s what they found:
1. The most people respond to emails between 75 and 100 words: 51%
2.Response rates went from 50% for messages with 125 words to about 44% for messages with 500 words.
3.Then it stayed the same (44% flat) until there were about 2000 words.
4. Response rates dropped below 35% when they were over 2500 words.
Source: blog.boomerangapp.com