Hello mailop, We're a "small" internet service provider in Switzerland and are running mail services for our customers.
Since a long time, customers are complaining that the mail they send are always getting to junk folder at outlook.com (no issues with gmail for example). We give a lot of time to keep our mail servers reputation as good as possible and I think we're quite doing a good job at it. - We're not in any blacklist - Our senderscore is at the moment 98% - Talos intelligence mail reputation is good. - Our customer domains have spf records, dkim, dmarc configured and checked with no errors. - On the Microsoft SNDS we have no apparent issue and the complaint rate is always <0.1% https://i.imgur.com/rBJXlV6.png So, we don't get it. The mails (even being simple mails like "Hello Matthias, how was your weekend, get back to me soon", and not newsletters or other stuff.) are still being marked as junk. Also they are by default automatically deleted after 10 days as stated when you enter the Junk mail folder on Outlook. I've checked the headers on outlook.com of received mail that are going into junk mail, everything is green. SPF=pass, dkim=pass, dmarc=pass. We've opened many times support request filling the Microsoft form for reporting these problems. No real explanation or problem resolving on this path. So, what can we do about it? Is there a way to have a correct answer about the issue from Microsoft ? We really would like to understand. In the meantime, I can send a garbage mail from gmail.com to outlook.com and it ends up in the Inbox, even it's pure spam. It feels like if big mail providers have whitelisting agreement between them and being really aggressive with mails coming from small mail services despite we're working our asses of to keep our outgoing mails clean. Is it an unfair (illegal?) way to push our customers to move to outlook.com service thus killing our small ISP business ? This is really frustrating and I really would love to understand and find a solution for this. However we have no way to know what this is happening as the filtering techniques are obscure (maybe to protect them, but I'm sure spammers know much better about it than legit sysadmins...) Thanks a lot for reading and king regards. Sébastien RICCIO SYSTEM ADMINISTRATOR P +41 840 888 888 F +41 840 888 000 M sric...@swisscenter.com _______________________________________________ mailop mailing list mailop@mailop.org https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
