RE: registry for onmicrosoft[dot]com

[Jon Lewis <jlewis () lewis org>]

On Fri, 8 Mar 2024, Sean Donelan wrote:

> On Sat, 9 Mar 2024, Travis Garrison wrote:
> >  This would be a company that has registered for an office365 account.
> >  Office
> >  365 company accounts are registered as companyname [dot] onmicrosoft [dot]
> >  com. You then add domain aliases if you want to use your own preferred
> >  domain name.
>
> Microsoft "Know Your Customer"
>
> Just a sampling of company names used for an office365 account.
>
> n8uob4m[dot]onmicrosoft[dot]com
> xenfx49[dot]onmicrosoft[dot]com

header onmicrosoft_spammer      From =~ /<\S+\@\S+\.onmicrosoft\.com>/
score onmicrosoft_spammer       15
describe onmicrosoft_spammer    Reject mail from Microsoft spammer obfuscation service

After a bit of whack-a-mole with spam coming from various onmicrosoft.com 
sub-domains, I arrived at the above, and haven't noticed any negative 
effects.

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