/var/spool/exim4/gnutls-params is in exim4-base 4.76-3ubuntu3.4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | -----BEGIN DH PARAMETERS-----
MIIBCAKCAQEArYVHPGLKJ8ugLSZhvJXKI7L/AJI+8RvtKkCt9WCntDIwG8ZdUQFP
YNZC5dk4yISA3aw34DS6ihFIhQUm/eLt6/m034/gNdoWTqRdk1K2+TpwEcHSZ8ir
ynyqqiQGWxoHe9YJyLzeAY+FlYh55JEnx2yiPRQxQCnQYR7e5PxCm0SDqkCVcHwh
VELpKbgsdlM43NZ/RXesBR/o95H21TMbz42LzaV7tqoT9r/iDlrXCHM3XeY4HjbZ
cRp13LaCqORMOsEccVugTE/1RFUIla/CnDSuwKbIBDksEMvbusI61wre5yrd1tIY
3X5z7sMtkaAKfhBqc65svjVRS8FbOy12SwIBAg==
-----END DH PARAMETERS-----
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