unknown: warning: ignoring 2nd key at index 4 in warn-mixed-multi-key.pem after 1st at 2
depth = 0
issuer = /CN=EC issuer CA
subject = /CN=mx1.example.com

depth = 1
issuer = /CN=EC root CA
subject = /CN=EC issuer CA

depth = 2
issuer = /CN=EC root CA
subject = /CN=EC root CA