One needs to use the square brackets [ ] in this case (one of the few cases when there is no escape).

So the incorrect syntax SERVER.DOMAIN.DATABASE.SCHEMA.TABLE must become

[SERVER].[DATABASE].[SCHEMA].

e.g.

SELECT TOP 1 *

FROM [MYSERVER.MYDOMAIN.MYCORP.MYCOMPANY.COM].[MYDATABASE].[dbo].[MYTABLE] ;