> Can I see some evidence before I sink a bunch of time into answering
> a question?


ok, origin server has: 

myhostname = STATS2.2e-systems.com
mydomain = stats.2e-systems.com
myorigin = $mydomain
relayhost = v2.eentf.com:587




Feb 13 09:32:38 STATS2 postfix/pickup[1724826]: 61C241CE21: uid=505 from=<stats>
Feb 13 09:32:38 STATS2 postfix/cleanup[1813737]: 61C241CE21: 
message-id=<[email protected]>
Feb 13 09:32:38 STATS2 postfix/qmgr[402083]: 61C241CE21: 
from=<[email protected]>, size=330, nrcpt=1 (queue active)
Feb 13 09:32:38 STATS2 postfix/smtp[1813740]: 61C241CE21: 
to=<[email protected]>, relay=mail2.v2.eentf.com[174.138.14.219]:587, 
delay=33, delays=33/0.05/0.08/0.06, dsn=2.0.0, status=sent (250 2.0.0 Ok: 
queued as 943B8CCEE05)
Feb 13 09:32:38 STATS2 postfix/qmgr[402083]: 61C241CE21: removed


so far so good, but on mail2.v2.eentf.com <http://mail2.v2.eentf.com/>:

masquerade_classes = envelope_sender, header_sender, header_recipient
masquerade_domains = 2e-systems.com


[[email protected]] fgrep 943B8CCEE05 /var/log/maillog
Feb 13 08:32:38 mail2 postfix/smtpd[3873524]: 943B8CCEE05: 
client=stats2.2e-systems.com[213.198.74.82]
Feb 13 08:32:38 mail2 postfix/cleanup[3873509]: 943B8CCEE05: 
message-id=<[email protected]>
Feb 13 08:32:38 mail2 opendkim[2498371]: 943B8CCEE05: no signing table match 
for '[email protected]'
Feb 13 08:32:38 mail2 postfix/qmgr[3729579]: 943B8CCEE05: 
from=<[email protected]>, size=565, nrcpt=1 (queue active)
Feb 13 08:32:47 mail2 postfix/smtp[3872588]: 943B8CCEE05: 
to=<[email protected]>, relay=mx2.forwardemail.net[104.248.224.170]:25, 
delay=8.9, delays=0.05/0/1.6/7.3, dsn=2.0.0, status=sent (250 OK: message 
queued)
Feb 13 08:32:47 mail2 postfix/qmgr[3729579]: 943B8CCEE05: removed

so the envelope from has been rewritten, but the received email looks like this:

...
Received: from STATS2.2e-systems.com (stats2.2e-systems.com [213.198.74.82])
by eentf.com (Postfix) with ESMTP id 943B8CCEE05
for <[email protected]>; Tue, 13 Feb 2024 08:32:38 +0000 (UTC)
Received: by STATS2.2e-systems.com (Postfix, from userid 505)
id 61C241CE21; Tue, 13 Feb 2024 09:32:38 +0100 (CET)
From: [email protected]
To: [email protected]
Subject: masquerade test
Message-Id: <[email protected]>
Date: Tue, 13 Feb 2024 09:32:05 +0100 (CET)

testttt

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