When communicating with sources are we supposed to use the same e mail service that they use? I realize we have to use encrypted services such as proton, tutanota, etc. , but is it ok to send from proton to CounterMail or proton to tutanota etc. ? Obviously these are new to me, and I was reading on one of the sources pages that we shouldn’t send to tutanota from proton or vice versa. I’ve recently sent from proton to a source that uses CounterMail and haven’t heard back from him.
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