After giving this a bit of thought, I can only surmise that the outgoing server can be left blank, and will use some unknown mail relay or perhaps a built-in smtp server. If for some reason that doesn't work, we can specify some other server such as hotmail, gmx, or whatever we have access to, such as our ISP.
I looked at the headers of a test email I sent to myself, and can't see any recognizable servers, just my IP address, so it seems like it may be built in to Calibre, but I'm not an expert.
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