Need help fixing emails that keep bouncing back rejected.

Jasmina de la Torre 0 Reputation points

How to fix emails bouncing back/rejected by receiving server. Suddenly having trouble with more than one recipient.

Diagnostic information for administrators:

Generating server: Receiving server: Total retry attempts: 3

Message expired -> 421 4.4.2 Connection dropped due to SocketError'

A family of Microsoft email and calendar products.
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  1. ChristyZhang-MSFT 20,616 Reputation points Microsoft Vendor

    Hi @Jasmina de la Torre ,

    Welcome to our forum!

    What's your account?
    And does this issue occur with all emails or some specific emails? If some specific emails, do they have anything in common?

    Based on my research, i found a similar issue as yours in this article, please refer to it and check if it is your case: Can't send or receive email when using TLS 1.1 or TLS 1.0.

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    Hope to help you!

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