Depends on what your client needs. I run a webflow business and I have had customers who come to me and have been offered that in the past but I simply tell them from the start if they need any backend features than hosting will start at $12 up to $16 for CMS. With Webflow it can be hard to offer seperate hosting options unless you have extensive development knowledge and can export the code then develop your own backend. If you own the domain they are using though which you should not. SHOULD NOT. I cannot stress that enough. then you can help them setup their own email with their domain provider. I find this is a more reliable solution and builds further trust with clients. 90% of my clients come to me because i write a contract signing everything over because in the past no other web designer has and then they get screwed over if they want to hand it off to another designer or developer. Let me know if that answers your questions! Would be happy to help you switch your workflow onto webflow 
I would also highly recommend you take a look at the freelancers journey that webflow has created.
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