+1
But now if we can ONLY get Amazon, GoogleCloud, and Azure to start doing
the same thing ;) Still far too many bad actors relying on the network
being 'too big to block' and very loose SWIP/rwhois.
On 2019-08-22 8:41 a.m., Laura Atkins via mailop wrote:
In my experience, when the bounce message says "Please contact your
Internet service provider since part of their network is on our block
list (S3150).” That means that Microsoft is seeing problems across a
wide range of IPs in a space and they don’t have a clear picture of
where the customer boundaries are. You may find a better customer
experience if you SWIP IPs to your customers rather than just lumping
them all into a single /16.
Are these the IPs you’re using for forwarding? If so, how much filtering
are you doing before you forward them?
laura
On 22 Aug 2019, at 16:08, Benoit Panizzon via mailop
<mailop@mailop.org <mailto:mailop@mailop.org>> wrote:
Hi List
One of our mail platform IP has once more been hit by an outlook.com
<http://outlook.com>
blocking:
host outlook-com.olc.protection.outlook.com
<http://outlook-com.olc.protection.outlook.com>[104.47.4.33] said: 550
5.7.1
Unfortunately, messages from [157.161.12.116] weren't sent. Please contact
your Internet service provider since part of their network is on our block
list (S3150). You can also refer your provider to
http://mail.live.com/mail/troubleshooting.aspx#errors.
[AM5EUR02FT063.eop-EUR02.prod.protection.outlook.com
<http://eop-EUR02.prod.protection.outlook.com>] (in reply to MAIL
FROM command)
According to MX-Toolbox that IP is not listed anywhere.
According to our report on:
https://sendersupport.olc.protection.outlook.com/snds/ipStatus.aspx
"All of the specified IPs have normal status."
On View Data there are occasional 'trap' hits for that IP and the
history show < 0.1% but 9 red days.
We also had a spike with 2% trap hits, but that is not flagged as 'red
day'.
So somehow I don't quite understand what 'red day' means and what could
cause the IP to be blocklisted right now I think we are doing a pretty
good job keeping our mailserver clean from phished accounts.
Anyone with more insight?
Mit freundlichen Grüssen
-Benoît Panizzon-
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