So today in work I tried making an SMTP email to our local mailserver. Using colleagues email name I sent an email to another colleague. The email didn't fall in spam and it actually showed the profile picture and online status from the actual real user. I think this is a critical vuln as anyone can send emails as anybody in the organisation, with high credibility. Do you know the cause and if it can be fixed ? Hell, it even synced with Outlook Online(no warning about spam, nothing).

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    What you are describing is an Open Mail Relay. Yes, this is a problem. Oct 23 '21 at 0:59

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