I might be mistaken, but it looks like there's mis-configured email
server settings.
While reviewing and tightening up security settings on one of my email
servers, I found some log entries indicating problems...
DKIM on the list's messages (signed messages but no key in DNS?):
https://mxtoolbox.com/SuperTool.aspx?action=dkim%3adefault._domainkey.driftwood.blu.org&run=toolpage
Feb 4 23:31:49 kwvoip postfix/cleanup[1388571]: 75EAD8106B: reject:
header Authentication-Results: driftwood.blu.org;??dkim=fail
reason="signature verification failed" (2048-bit key)
header.d=millermicro.com [email protected] header.b="rOHhWpz1"
from unknown[131.226.247.88];
from=<[email protected]>
to=<[email protected]> proto=ESMTP helo=<driftwood.blu.org>: 5.7.1 "DKIM
FAIL: invalid DKIM: your server's DKIM record is missing or invalid"
$ dig +short txt default._domainkey.driftwood.blu.org
$
Also, not sure if BLU or Natick, but rDNS does not seem setup for email
server:
Feb 4 23:31:48 kwvoip postfix/smtpd[1388566]: NOQUEUE: reject_warning:
CONNECT from unknown[131.226.247.88]: 450 4.7.25 Client host rejected:
cannot find your hostname, [131.226.247.88]; proto=SMTP
$ dig +short -x $(dig +short driftwood.blu.org)
$
And, no SPF too?!?
https://mxtoolbox.com/SuperTool.aspx?action=spf%3adriftwood.blu.org&run=toolpage#
Feb 4 23:31:49 kwvoip policyd-spf[1388569]: prepend Received-SPF: None
(mailfrom) identity=mailfrom; client-ip=131.226.247.88;
helo=driftwood.blu.org;
envelope-from=natickfoss-discuss-bounces+ron=bclug...@lists.blu.org;
receiver=<UNKNOWN>
$ dig +short txt driftwood.blu.org
$
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