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Receiving spam emails from external domains with attachments - auth source - my server

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Receiving spam emails from external domains with attach... - 25.Aug.2016 3:05:10 AM   
szynkiel

 

Posts: 1
Joined: 25.Aug.2016
Status: offline
Hi.
I have fresh Exchange 2016 installation .
2 users reported issue with spam - they receiving 5-10 messages per day with attachments.
1st time they received emails from their email address. I've installed and setup Sender ID agent and SPF record and for few days was clear. After few days they stared receiving emails from external domains... I've checked headers and found - all messages are sent using our own exchange server via Frontend transport.

I've done many tests with auth as anonymous and looks like:
I cannot use my exchange server to send email using my domain from ip addresses not listed on SPF record.
I cannot sent email to external domain.
I cannot sent email from domain which one not exists.
I cannot sent email from domain which one has correct SPF record.

... but I can send email from various domains to my domain ...

Question is, how I can stop it? When I removed annonymous users from Default Frontend receive connector I wasn't be able to receive any external email (not checked internal).
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