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It seems not possible to use smtpd in certain contexts, because it forces use of global state. For example, I'm looking at implementing a test SMTP server to test logging's SMTPHandler. Neither SMTPServer nor SMTPChannel allow a map to be passed in, forcing use of the global socket_map in asyncore. Both of these classes should accept an optional map argument - the map passed to SMTPServer should be stored in the server instance and passed when creating an SMTPChannel in handle_accepted.