Ok I think I understand what is wrong. It seems that the SMTP library
used by sourcehut LMTP daemon does not understand [1] the "ORCPT=" part
in the RCPT-TO command that seems to be allowed by the RFC1891.

Until aiosmtpd support RFC1891, is there a way that OpenSMTPD can get
rid the ORCPT part?

[1] https://github.com/aio-libs/aiosmtpd/issues/183

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