How to authorize sender email for external domain?

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Hi , I’m configure some servers for use relay ns8 for sendings emails in to internal domain and is run correctly . How to configure this servers for sendings email for another domain by a relay ns8 ?

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Relay of message must be authorized. Clients (like servers, printers, user agents…) should authenticate with SMTP/AUTH or be identified by IP. Please refer to Mail — NS8 documentation.

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Thanks, I was looking at other options … now it works