submission service does not rewrite Received: headers
Example, with DNS name and IPv4 address redacted.
Received: from smtp.adb-centralen.se (smtp.adb-centralen.se [184.108.40.206]) by imap.adb-centralen.se (Postfix) with ESMTP id 248C0313443 for <firstname.lastname@example.org>; Mon, 17 Jan 2022 16:50:20 +0100 (CET) Received: from submit-01.torproject.org (submit-01.torproject.org [220.127.116.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "clientcerts/submit-01.torproject.org", Issuer "auto-ca.torproject.org" (not verified)) by smtp.adb-centralen.se (Postfix) with ESMTPS id ED53CC66945 for <email@example.com>; Mon, 17 Jan 2022 16:50:19 +0100 (CET) Received: from besk (REDACTED-DNSNAME [REDACTED-IPV4-ADDRESS]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) (Authenticated sender: linus) by submit-01.torproject.org (Postfix) with ESMTPSA id D0D2A80086 for <firstname.lastname@example.org>; Mon, 17 Jan 2022 15:50:18 +0000 (UTC)
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information