emisor1

¹ = issuer, sender, submitter.

Ex. A certificate authority is an issuer of security certificates used in SSL connections.

Ex. All mail can be stored and later accessed by keywords (such as the name of the sender, the date, the subject, etc.).

Ex. A confirmation email is sent to the address supplied by the submitter to verify that it is correct.

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* de emisor a receptor = downstream.

* de receptor a emisor = upstream.

* emisor de luz = light-emitting.