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Text based emails in lightning
In classic, however, you can go to the case detail screen and email related list and send a pure text based email. This is perceived as allowing a lot more of the email thread.
In Lightning there is no way, that I have found, to send a pure text based email so that it seemingly holds more characters.
Has any solved for this or is it a fact if you use lightning this is how it is?
You can ask salesforce support to increase your character limit from 32000 to the Maximum 131,072 characters. I have done this for 2 clients so far and salesforce will give you this increase in a few days.
Go to https://help.salesforce.com/home and scroll down and hit button "Contact Support"

Login with your credentials and ask for the increase.
For more reference:
https://www.youtube.com/watch?v=XvfQFOs26Ww
https://help.salesforce.com/articleView?id=000334028&type=1&mode=1
All Answers
You can ask salesforce support to increase your character limit from 32000 to the Maximum 131,072 characters. I have done this for 2 clients so far and salesforce will give you this increase in a few days.
Go to https://help.salesforce.com/home and scroll down and hit button "Contact Support"

Login with your credentials and ask for the increase.
For more reference:
https://www.youtube.com/watch?v=XvfQFOs26Ww
https://help.salesforce.com/articleView?id=000334028&type=1&mode=1
Resolution"
Great! With a bit of luck your client won't have this error message from tomorrow :)