[Alpine-info] why a message sent to alpine-info is rejected ?

[Lucio Chiappetti]

I just composed a message to alpine-info but it was rejected with the 
following error

<alpine-info at u.washington.edu>
     (reason: 550 5.7.0 Message not accepted as it appears to be spam (IS))

The header was

From: Lucio Chiappetti <lucio at lambrate.inaf.it>
To: Alpine List <alpine-info at u.washington.edu>
Date: Mon, 22 Jan 2024 16:15:09 +0100 (CET)
Subject: my solution to recent gmail issues