Email Settings - zoho mail

1

What is the solution to this problem?

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2

Try to change the port to 465 if it makes any difference. Other than that, you should try these settings in another email client to see if it’s issue with Manager only.

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Look at https://help.zoho.com/portal/en/community/topic/smtp-error-data-end-command-failed-553-relaying-disallowed-smtp-error-data-not-accepted-mailer-error-smtp-error-data-not-accepted