email sending error - server responded: 421 unexpected failure, please try later (outlook)

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Trying to send from my outlook e-mail but it isn't working.
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Posted 6 days ago

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Elyzabeth , Official Rep

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Everything on our end is set up properly, I see no issues. Can you try sending email from Roundcube? You should be able to send successfully with no error.
I would recommend checking all settings on Outlook:

Other than that, we cannot troubleshoot Outlook error codes, so I would recommend contacting their support.