Gmail smtp server not accepting emails
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Starting from May 30, 2022, Google no longer supports Less secure apps option.
If you want to use Gmail email severs in MOR/M4 How to set up Google App Passwords and use this App Password in MOR/M2 configuration.
If the email still does not work, login to your google account used in MOR/M4 and press this link: https://accounts.google.com/b/0/DisplayUnlockCaptcha