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> > wrote: > > Hi List > > One of our mail platform IP has once more been hit by an outlook.com > blocking: > > host 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] (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- > -- > I m p r o W a r e A G - Leiter Commerce Kunden > ______________________________________________________ > > Zurlindenstrasse 29 Tel +41 61 826 93 00 > CH-4133 Pratteln Fax +41 61 826 93 01 > Schweiz Web http://www.imp.ch > ______________________________________________________ > > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop -- Having an Email Crisis? We can help! 800 823-9674 Laura Atkins Word to the Wise la...@wordtothewise.com (650) 437-0741 Email Delivery Blog: https://wordtothewise.com/blog
_______________________________________________ mailop mailing list mailop@mailop.org https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
