Email marked as spam

I just sent an email to pgsql-docs(at)lists(dot)postgresql(dot)org and got back
this error:

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

pgsql-docs(at)lists(dot)postgresql(dot)org
host magus.postgresql.org [87.238.57.229]
SMTP error from remote mail server after end of data:
550 This message was classified as SPAM

The message id was 20201125173409(dot)GC26300(at)momjian(dot)us(dot) Any idea on the
cause or correction?

--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EnterpriseDB https://enterprisedb.com

The usefulness of a cup is in its emptiness, Bruce Lee