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Default greylist set has overlapping ranges
Problem reported by Nick Jansen - 5/8/2024 at 10:52 AM
Resolved
While testing Linux beta build 8887, I noticed the default greylist IP address set (Settings -> Antispam -> Greylist Filters) has some overlapping ranges. I don't know if that's intentional or not but I thought it's worth pointing out just in case. I just checked my production build 8888 and it's the same too, but I don't use greylisting so I didn't notice until I started testing the beta.

40.92.0.0-40.92.255.255 Outlook.com (Germany Endpoints)
40.92.0.0-40.93.255.255 Outlook.com

52.100.0.0-52.103.255.255 Outlook.com
52.103.0.0-52.103.127.255 Outlook.com (Germany Endpoints)

72.21.192.0-72.21.223.255 Amazon.com and Amazon Cloud
72.21.217.142 Amazon.com and Amazon Cloud

94.245.112.0-94.245.112.31 Outlook.com
94.245.112.10-94.245.112.11 Outlook.com

104.47.0.0-104.47.127.255 Outlook.com
104.47.20.0-104.47.21.255 Outlook.com (Germany Endpoints)
104.47.53.0-104.47.53.255 Outlook.com (Germany Endpoints)
104.47.75.0-104.47.75.255 Outlook.com (Germany Endpoints)
104.47.108.0-104.47.109.255 Outlook.com (Germany Endpoints)

157.56.240.0-157.56.255.255 Outlook.com
157.56.248.0-157.56.255.255 Outlook.com

205.201.128.0-205.201.143.255 eBay
205.201.137.229 eBay

207.46.50.192-207.46.50.255 Outlook.com
207.46.50.224 Outlook.com

2a01:111:f403:8000::-2a01:111:f403:9fff:ffff:ffff:ffff:ffff Outlook.com
2a01:111:f403:8000::-2a01:111:f403:bfff:ffff:ffff:ffff:ffff Outlook.com (Germany Endpoints)

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Kyle Kerst Replied
5/8/2024 at 4:54 PM
Employee Post
I am seeing these as well Nick, thanks for pointing that out! I'm going to check in with dev on this and I'll get you an update as I find out more. 
Kyle Kerst System/Network Administrator SmarterTools Inc. (877) 357-6278 www.smartertools.com
0
Kyle Kerst Replied
5/9/2024 at 8:35 AM
Employee Post Marked As Resolution
I checked in with development on this for you and unfortunately we don't have a whole lot of control over this one. We build this list of addresses from a list of domain names using SPF lookups, and it appears some of those SPF records have overlapping ranges. From what I understand this isn't problematic though, so we should be okay!
Kyle Kerst System/Network Administrator SmarterTools Inc. (877) 357-6278 www.smartertools.com
0
Nick Jansen Replied
5/9/2024 at 8:52 AM
OK cool, yeah I figured it wouldn't cause any actual problems and was just more of a cleanup issue. Thanks for checking!
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