this is my fullchain.pem file
root@correo:/etc/letsencrypt/live/correo.grupomk.com.ar-0001# cat fullchain.pem
-----BEGIN CERTIFICATE-----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YXePvXWmOLHHaFRL2I0AAAFpi8K2ZgAABAMARzBFAiEAv+ION+lmvaZ3MbXgdxOj
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iqDrMA0GCSqGSIb3DQEBCwUAA4IBAQBZcXSva9OxCCjOzIjgu47AFdv4u4PDmX6R
Vbszrp8Pxg1oQOuYWwyo90O6C24Mega9lAgEZNmmDKqyQ1QFVkrho4+WBFSp0mwi
PgeFvfvIc/kpZ2hI7VfhfGMqryUrKxOX3ZIku2jIWUZOgy48e6+DHpUCYRYFIp2S
4dKJZoi+BQX4y2oLfPjzjaBi6QAz+wjkM/nhZ+fS+vaCa0FSmrpFMfcFY0fd+gQX
DUrACm2G3lOfsbNzgwbsmR5biY6XqxBCvXQQu63WaoVwqPvhlMIY4O2BqOqj/mGh
Yb/8jYdLBPtlsQ0u915xc0EfmziKBW38tQxBNnYkgXrA0z7adJp5
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----