We have, just not here. 😊

It's being ... investigated.

Sorry for the delay.

Aloha,
Michael.
--
Michael J Wise
Microsoft Corporation| Spam Analysis
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-----Original Message-----
From: mailop [mailto:[email protected]] On Behalf Of Scott Undercofler
Sent: Friday, February 9, 2018 2:15 PM
To: mailop <[email protected]>
Subject: Re: [mailop] Extreme amounts of SMTP auth from microsoft/outlook IPs



Its hitting a set of accounts over and over and over at least on my ā€œolderā€ 
system. On the newer system, Im blocking them for too many connections today so 
its hard to tell.



Strangely enough the MS contacts on this list haven’t chimed in….







> On Feb 9, 2018, at 2:56 PM, Dave Warren via mailop 
> <[email protected]<mailto:[email protected]>> wrote:

>

> On 2018-02-09 14:20, John Levine wrote:

>> In article 
>> <CABa8R6txLmPrVSbVXzQBM+UB=fx6tdlv_ebpalps1q1ktvh...@mail.gmail.com<mailto:CABa8R6txLmPrVSbVXzQBM+UB=fx6tdlv_ebpalps1q1ktvh...@mail.gmail.com>>
>>  you write:

>>> I'm confused, the first post said valid credentials, is that what

>>> everyone else is seeing?

>>>

>>> Nearly all valid creds seems weirder than mostly invalid... modulo

>>> whatever amount of hijacked or reused creds there are.

>> Remember that Outlook does account consolidation like Gmail does, and

>> outgoing mail for a consolidated address usually goes through the

>> account's own server to make it more DMARC-y.

>> It's not surprising that Outlook would be doing valid SMTP AUTH, but

>> you would expect it to send a message after it does so.

>

> I could imagine them doing a periodic recheck to validate passwords or find 
> problems too, but I would only expect a single connection per account.

>

> For those seeing this, is it hitting the same account more than once, or just 
> once per account?

>

>

>

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