PKCS#3 representation of the DH prime. If the file does not exist, for
OpenSSL it is an error. For GnuTLS, Exim will attempt to create the file and
fill it with a generated DH prime. For OpenSSL, if the DH bit-count from
-loading the file is greater than &%tls_dh_max_bits$& then it will be ignored,
+loading the file is greater than &%tls_dh_max_bits%& then it will be ignored,
and treated as though the &%tls_dhparam%& were set to "none".
If this option expands to the string "none", then no DH parameters will be