I'm playing in a campaign that involves an interdimensional hub of sorts, wherein adventuring parties are given missions and teleported across space/dimensions to the location. Upon completion, in order to return, they are given a spell scroll of Sending by which they contact a dispatcher, who then opens a portal back.
The phrasing of the Sending spell specifies:
The creature hears the message in its mind, recognizes you as the sender if it knows you, and can answer in a like manner immediately.
How are we to interpret this?
For example, suppose a character were to use Alter Self to disguise themselves as someone else, use a different name, forge an assignment, and use that to get to a location of their desire. Upon casting Sending to return, would they be recognized as their "true self", or simply as the person the recipient knows them as?
Is there any means by which an identity can be masked as someone else (or otherwise concealed), specifically in regards to Sending?
Note: There is one dispatcher in particular we interact with the majority of the time who we know well, but there are theoretically others we haven't interacted with yet, if that makes any difference.