On 2020-08-30 18:08 BST, dave wrote:
> So what I'm looking for is the easiest way of accepting that email,
> while staying pretty secure.

>From your home machine, send mail to the server's submission port and
with authentication, as in
<http://www.postfix.org/SOHO_README.html#client_sasl_enable>.

HTH,
-- 
Nick

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