There are 2 ways to send an excerpt of your post to your subscribers.
- In Settings > Reading, you can set your feed settings to “Summary”. Once you have saved your changes, Jetpack will only send an excerpt of your post to your subscribers.
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You can split the content of each one of your blog posts in 2 parts thanks to the More tag:
<!--more-->
Everything that is above the More tag will appear on your home page and in the subscription emails, followed by a link inviting users to click to continue reading; everything that is below that tag will only appear on the post’s page.
You can read more about it here:
http://en.support.wordpress.com/splitting-content/more-tag/
well i put my whole post in the excerpt so that doesn’t really help.
Why can’t i just send the link?
If you put your whole post in the excerpt, I’d suggest using the second method I highlighted above. That will work.