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Comment by vedranm | Hacker News Reader

Are you sure that the infrastructure behind Outlook and Office 365's Outlook is sufficiently different? I was under the impression that it's similar if not the same. Compare Outlook:

  $ dig mx outlook.com
  ;; ANSWER SECTION:
  outlook.com.            300     IN      MX      5 outlook-com.olc.protection.outlook.com.

with my university that is a customer of Outlook on Office 365:

  $ dig mx uniri.hr
  ;; ANSWER SECTION:
  uniri.hr.               86251   IN      MX      0 uniri-hr.mail.protection.outlook.com.

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You're not wrong, but Microsoft's Exchange 365 does have a lot of knobs to control (https://docs.microsoft.com/en-us/microsoft-365/security/offi...) and the defaults are more relaxed, probably as concession to those migrating from on-premise solutions. I'm guessing that they turn the knobs into the most aggressive position for their personal services.

Even if the infrastructure is very similar, it can be set up with completely different configurations.

The free version has probably a lot of features turned off.

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