documentation on how to configure credentials from the appsettings.json file

[doreille]

The configuration parameters have changed in version 3.0.
Prior to version 3.0, SMTP credentials were configured using the userName and password attributes.
From version 3.0 onwards, the SMTP credentials are configured using the credentials attribute which has the ICredentialsByHost interface type.

I haven't found any documentation or examples of how to set this. I try

"credentials": {
"type": "System.Net.NetworkCredential, System.Net.Primitives",
"UserName": "#########",
"Password": "#########"
}

but this return the error System.InvalidOperationException: 'Cannot create instance of type 'System.Net.ICredentialsByHost' because it is either abstract or an interface.'