On Sun, Dec 05, 2021, Alessandro Vesely via mailop wrote:
> 220 resimta-h1p-037571.sys.comcast.net resimta-h1p-037571.sys.comcast.net
> ESMTP server ready
> rcpt to:<postmaster>
> 550 5.1.1 Not our customer
RFC 5321 SMTP October 2008
o The reserved mailbox name "postmaster" may be used in a RCPT
command without domain qualification (see Section 4.1.1.3) and
MUST be accepted if so used.
Oh well...
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