There are some contributions to your problem in the Kayako community forums. Did you try searching or contacting Kayako Support?
Chances are against it, as "Kayako" and "Support" are no longer a "thing".
They sold to a venture capitalist and basically killed the download version with absurd prices and total neglect.
As for piping, you can instead switch to querying the email account via POP as a temporary solution. If the pipe fails on Namecheap, it's up to them, not the Kayako software. I know, with some providers in the past, we've had to put the pipeline path in quotation marks to set it up to work. I've never hosted anything with NC, so I'm not sure.