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authentication failure [SMTP: STARTTLS failed (code: 220, response: TLS go ahead)]

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Hello there;

When Completing E-Mail Configuration "Authentication Required" Part Selected Yes . I am receiving an Error Message as below.

authentication failure [SMTP: STARTTLS failed (code: 220, response: TLS go ahead)]

All the Information I Entered in the Related Areas is Correct.
"Authentication Required" Part Selected No. Recording Configuration. But Mail Notification does not come.

How can I solve this problem?

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