Using CM without Email Authentication?

I was just wondering if anyone uses CM without email authentication for their clients, and if you do, do you run into any problems?

I am a designer using CM for myself and would like to setup accounts/templates for clients that are interested in sending email themselves.

But I often do not have access to their domain or hosting accounts. Asking for access could possibly confuse or annoy them, and trying to explain how to do it themselves would be confusing. I wanted to find out how others are handling authentication for clients, and do they have client accounts that don't use it.

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