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SMTP Configuration Error 503 you must authenticate first (#5.5.1)

Dear All;

I configured the bases on the document

I finished all the mentioned steps, but when I try to send an email from the system itself I get the error: cannot be sent: 503 you must authenticate first (#5.5.1) as you can see below:

Kindly let me know how I can fix this error.

Best Regards

~Amal Aloun

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