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Spam - any tips?

We seem to be under a spam attack with a malicious html attachment. I've blocked html, htm etc as a last resort.

The emails have gone straight through our UTM spam filter and are coming from outbound.protection.outlook.com with numerous IP's etc

Anybody got any tips on how to block?



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Parents
  • Most span use "open" mail server to send email.

    I assume the use of outlook.com is not with a domain that is registered in the same location in 365. (each domain has its own cname)

    Try to add "strict dns" check in the smtp policy.

    This will reduce the spam and also will avoid mail sent from organizations that did not config their mail server properly.

Reply
  • Most span use "open" mail server to send email.

    I assume the use of outlook.com is not with a domain that is registered in the same location in 365. (each domain has its own cname)

    Try to add "strict dns" check in the smtp policy.

    This will reduce the spam and also will avoid mail sent from organizations that did not config their mail server properly.

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