So, I'm still find messages blocked as spam when the IP address of the
mail server is in my dns whitelist, but is also part of a larger
blacklist dns.
I maintain a blacklist and a whitelist on my own local DNS. The
blacklist contains entries that cover what I feel are bad actors (ie /24
or /16 ranges), but I also whitelist specific IP addresses or ranges
within those blocks. For example, I may have a /16 blacklisted, but have
a few /24's within that range whitelisted.
I don't believe all messages are block, just the occasional one. For
example, here are the headers (redacted) from a message that was
rejected just yesterday:
X-Assp-Version(1): 2.6.3(20002) on ASSP.xmsi.net
X-Assp-ID(1): ASSP.xmsi.net m1-58780-12245
X-Assp-Session(1): 7F8A43600CA8 (mail 1)
X-Assp-Intended-For-IP(1): 165.254.4.90
X-Assp-Client-TLS(1): yes
X-Assp-Server-TLS(1): yes
X-Assp-NoProcessing(1): YES - (noProcessing - message size (3836221) is above
100000 (npSize))
X-Assp-Received-RWL(1): whitelisted from
(list.dnswl.org.wl.mcf.com->127.0.4.3,trust=3-[high]
(category=Organisations);) - high trust is 3-[high] -
client-ip=67.231.145.123
X-Original-Authentication-Results: assp.xmsi.net; dkim=fail;
dmarc=pass
X-Assp-Message-Score(1): 50 (DNSBL: failed, 67.231.145.123 listed in
bl.mcf.com)
X-Assp-IP-Score(1): 50 (DNSBL: failed, 67.231.145.123 listed in
bl.mcf.com)
X-Assp-DNSBL(1): failed, 67.231.145.123 listed in (bl.mcf.com<-127.0.0.8)
X-Assp-Tag(1): DNSBL
X-Assp-Spam(1): YES
X-Spam-Status:yes
X-Assp-Spam-Reason(1): DNSBL, 67.231.145.123 listed in bl.mcf.com
X-Assp-Message-Totalscore(1): 50
X-Assp-Spam-Level(1): ***********
X-Assp-Intended-For(1): recipi...@domain.com
X-Assp-Copy-Spam(1): Yes
Received: from mx0a-00306701.pphosted.com ([67.231.145.123]
helo=mx0a-00306701.pphosted.com)
by ASSP.xmsi.net with SMTPS(TLSv1_2 ECDHE-RSA-AES128-GCM-SHA256)
(2.6.3);
25 Sep 2020 14:33:00 -0400
In bl.mcf.com I have 67.0.0.0/8 blocked, however 67.231.145.0/24 is listed in
wl.mcf.com. Could the fact that the messages is over the NoProcessing
size be causing an issue?
Thanks for any insight into this.
--
Farokh
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