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(msg259748) ok, then I propose to correct https://docs.python.org/dev/library/smtpd.html?highlight=q#smtpd.SMTPServer from:
.. class:: SMTPServer(localaddr, remoteaddr, data_size_limit=33554432,\
 map=None, enable_SMTPUTF8=False, decode_data=True)
 Create a new :class:`SMTPServer` object, which binds to local address
 *localaddr*. It will treat *remoteaddr* as an upstream SMTP relayer. It
 inherits from :class:`asyncore.dispatcher`, and so will insert itself into
 :mod:`asyncore`'s event loop on instantiation.
To:
.. class:: SMTPServer(localaddr, remoteaddr, data_size_limit=33554432,\
 map=None, enable_SMTPUTF8=False, decode_data=True)
 Creates a new :class:`SMTPServer` object, which binds to local address
 *localaddr* and uses *remoteaddr* as an upstream SMTP relayer.
 Both parameters should be a tuple in the form ``("host", portnumber)``, where *host* is a valid IP/FQDN.
 The object will insert itself into :mod:`asyncore`'s event loop on instantiation (inherits from :class:`asyncore.dispatcher`) and can be started with a call to :class:`asyncore.loop`.
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These clarifications should be also inserted in the source code as heredocs (without the Sphynx syntax).
I really think that those changes will make the use of smtpd easier.