Am 22.03.20 um 08:37 schrieb Suresh Ramasubramanian via mailop:
>
> This is abuse of free trial accounts of office 365, and the document sharing 
> that sharepoint allows.   Create a
> document with porn spam text and share it, with a porn spam spiel, with a big 
> list of spam recipients.
>
>  
>
> That is the reply-to and not the originator of the email, I am not sure where 
> you got originator from.
>
>  
>
> --srs
>
>  
>
Ah thanks, that helps to understand! I'm not a Microsoft user, so I'm not 
really up to date on what kinds of products
and services they offer.

The From: header and envelope sender address "no-re...@sharepointonline.com" is 
just a mechanism to prevent automated
replies and rejects from getting anywhere, so it can't be considered the 
originator.

I suspect that the Reply-To is somehow the "originator" because it's possibly 
the mail address associated with the
account that is being used to spam, but that is just a guess as I don't know 
how Microsoft constructs the header
contents for this kind of spam. If the assumption is true, one way Microsoft 
could suppress this kind of spam would be
to refuse free trial registrations with such addresses or to restrict the 
sharepoint functionality for these accounts.

Cheers,
Hans-Martin

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