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The goal of this is to prevent anyone externally using spray attacks against accounts to gain a username and password вЂ“ although they couldnвЂ™t log in anywhere beyond SMTP due to MFA policies, they could still start sending emails that would be from a legitimate email address. These two rules together then block all users from legacy auth, except the ones on the second policy, and then only if theyвЂ™re coming from inside my network.

I then have a second policy вЂAllow Legacy Authentication Internal OnlyвЂ™ which I then target this user at, which still blocks legacy auth unless itвЂ™s coming from a trusted IP address. For an account I want to send emails from via SMTP, I add it as an exception to this policy. Personally, I have a вЂBlock Legacy AuthenticationвЂ™ conditional access policy which as it says, blocks legacy authentication. If you have them off, then you should have Conditional Access policies already. If you do this, understand what youвЂ™re turning off and rebuild those same settings in Conditional Access.

#SAPIEN POWERSHELL STUDIO CHANGE THEME HOW TO#

Microsoft have good documentation on вЂњ How to set up a multifunction device or application to send email using Microsoft 365 or Office 365вЂќ with the recommended approach to use SMTP, but you may need to poke some security holes through your environment.ДЄssuming you can get out through your firewalls on port 587 or 25 for SMTP, youвЂ™ll need to turn off Azure AD Security Defaults if you have them on. You are able to use Exchange Online as an SMTP server, but this can be tricky to set up if youвЂ™ve hardened your environment by requiring Multi-factor authentication through Security Defaults or Conditional Access. SMTP is still needed by certain applications and devices, such as printers, which donвЂ™t support Modern Authentication and instead require legacy authentication to talk to a SMTP server.

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