On 2022-09-12, Mihai Lazarescu wrote: >> Mihai Lazarescu <mtl...@gmail.com> wrote on Mon, 12 Sep 2022 at >> 15:07:37 EDT in <yx+dedsraermd...@lazarescu.org>: >> >> > Only Microsoft (outlook.com, hotmail.com) seem to filter the whole >> > IP block, but I am too lazy to ask the provider to fix or change >> > provider altogether. [...] > 1. [...] For work contacts on > Microsoft servers I use the work email (also on Microsoft). [...] > That being said, I found at work that Microsoft uses a very crude spam > filtering (kind of 1980s database-driven). E.g., it indiscriminately > junks all messages from almost any mailing list I join. Moreover, if I > un-junk the messages, Outlook behind the scenes whitelists the *sender > address*, not the list address/ID. Thus: > > - I've got myself a never ending job to move legit messages out of the > spam folder for every new sender seen on lists > > - I end up with a huge whitelist of people I don't personally know > > - if I go and clear the Outlook-built whitelist, the spam filter > behavior resets: all messages from the lists are junked, etc. (hence > my strong feeling that it's db.whitelist-driven). > > Besides, at the switch to Microsoft systems the sysadmins strongly > advised to carefully check the junk folder for important messages. And > I also found that Microsoft junked its own automated notifications, > e.g., for OneDrive shares. Go figure… > > In 2022 I find astonishing how much of Microsoft's antispam seems to > rely on lists (addresses, IP blocks…). Leading to annoying false > positives, with rates well higher than Google's. Microsoft's antispam > filters may very well include some well hidden adaptive smartness, > though. ;-)
They do, at least for domains which have bought MS's email "protection" service or the full cloud-based MS e-mail hosting. Microsoft calls it SmartScreen[1], and, with this, emails can get silently dropped - accepted but not shown anywhere in the recipient's mailbox, not even in the Junk folder. These dropped messages get sent to a separate "quarantine" feature. While non-admin users can access this and (at least from what I've read) see their quarantined messages[2], users have to know about this feature first. [1] https://www.nerd-quickies.net/2020/10/20/microsoft-silently-dropping-emails-a-sad-but-true-story/ [2] https://guides.downstate.edu/c.php?g=654922&p=4870487 -- Nuno Silva
