Overview

Customers may reach out to us to report that they are receiving an error when trying to send a message using Mailbird.

Mailbird was unable to send the message. Please check your 'From' identity's outgoing server settings.

Authenticate as SSL/TLS client failed.
You might be connecting to non SSL/TLS port -or- using incorrect SSL/TLS version. Consider using TLS 1.2:client.SSLConfiguration.EnabledSslProtocols = SslProtocols.Tls12;
Please examine the inner exception for details.

This article guides you with a solution to this particular error message in Mailbird.

Process

1. Click Open Settings from the error message window.
   
   
   
   
2. Change the Encryption from SSL/TLS to STARTTLS then click Test Connection to verify the settings.
   
   
   
   

Confirmation

You should now be able to successfully send a message using the Mailbird client.

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