I know how to control what text is show as the preview text/snippet (Litmus how-to here), but is there a way to force an end point for email clients that support longer character counts?

I am trying to solve situations when when we want shorter preview text, but the client supports a much higher character count and pulls in some of the email body copy in addition to the preview text.

For example, we only want the preview text to be, "Inspire your team to be all in at work with these fresh, compelling videos", but because this is only 74 characters, AOL and Gmail web interfaces also append some of the email content behind the preview like so, "Inspire your team to be all in at work with these fresh, compelling videos If you'd like to reinforce the videos' messages with books...".

Is there a way to prevent additional email body content from being appended to the preview text if it isn't maxing out the clients character count?

Thanks!