Question about Cosmic Background Radiation

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Cosmic Microwave Background (CMB) radiation has been detected emanating from intergalactic space, confirming its existence outside our galaxy. Observations since its discovery in 1965 reveal that the CMB comes from all directions with uniform intensity, indicating an extragalactic origin. The perfect blackbody spectrum of the CMB further supports that it is not due to diffuse starlight. These findings have solidified the understanding of the CMB as a remnant from the early universe. Overall, the evidence strongly indicates that the CMB is a cosmic phenomenon originating beyond our galaxy.
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I was wondering what experiments or observations have shown that the cosmic microwave background radiation exists outside our galaxy in intergalactic space. Have we detected it emanating from sources outside the galaxy? I know we've detected it here on Earth.
 
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Upon its discovery, circa 1965, the CMB was observed come from every direction with the same intensity, without diurnal or seasonal variations. On this basis, scientists concluded the signal had to originate outside our Galaxy. Further study showed it had a perfect blackbody spectrum, ruling out diffuse star light as the source.
 

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