Hello, sorry I won’t be of any help unless to tell you that it is NOT just you, and it seems like an important thing to investigate ! This happens to me with various emails simply never showing up.
When I did the command line you suggested it showed : postfix/smtpd[20526]: NOQUEUE: reject: RCPT from unknown[171.22.30.237]: 554 5.7.1 Service unavailable; Client host [171.22.30.237] blocked using cbl.abuseat.org; https://www.spamhaus.org/query/ip/171.22.30.237; from=spameri@tiscali.it to=spameri@tiscali.it proto=ESMTP helo=
I know for a fact that just yesterday a personal email and a neocities email never showed up.
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