Originally Posted by
rthonpm
Not necessarily. SMTP is still a valid method for sending email from embedded systems. IMAP and POP are still the only ways to connect many third-party mail clients (Thunderbird or any Linux mail client) to an M365 account. These are edge cases that most users don't need so the default has just been changed to turn them off.
Microsoft has already stated that SMTP will *not* be removed as an email method in their overall roadmap. Even the email reporting features in Windows Server use SMTP, and that includes the upcoming Server 2022.
The best practise is to have a dedicated Exchange account for anything that needs access to send email. It requires an M365 license, but only the basic license which gives Exchange and Office online which is $5 a month.
The bigger hole is using a third-party SMTP service which then removes the ability for admins to monitor what emails are being sent from corporate resources, or even what devices are configured to use a specific account. There are also a lot of DLP and legal discovery features that then get lost. This kind of setup can also lead to having a company device not sending from a true company email address and opening up the potential for phishing attacks as employees may see a malicious email from an outside address that they open thinking it's from an internal resource.
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