= Internet service federation
= Federated network service
{synonym}
<Internet service federation> permits independently administered services to communicate through agreed <protocols>. <Internet> mail is an example: separate domains can exchange messages without every user joining one provider. Federation differs from placing many replicas behind one mandatory account authority, and it does not itself establish <cryptographic confidentiality> or freedom from software failures.<Simple Mail Transfer Protocol (RFC 5321)>[§§2.1–2.3: communication model and domain-based delivery]{ref}
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