Added two environment variables, MODE and MX_WHITELIST.

[bdmc]

MODE can have the values DEV, TEST or PROD, while MX_WHITELIST
contains a comma-separated list of domains that will not be checked.

The updated "Apache Environment Variables" file will look like:

Variable | Description | Default value

---- | ---- | ----

DEPLOYMENT_NAME | name of the specific instance | "CAcert.org Website"

CRT_DIRECTORY* | directory where certificates are stored | none

CSR_DIRECTORY* | directory where CSRs are stored | none

MYSQL_WEBDB_DATABASE* | database name | none

MYSQL_WEBDB_HOSTNAME* | database hostname | none

MYSQL_WEBDB_PASSWORD* | database password | none

MYSQL_WEBDB_USER* | database user name | none

RETURN_ADDRESS* | return address (Errors-To header) for outgoing mails | none

SMTP_HOST* | mail server to use for outgoing mails | none

SMTP_PORT | port of the mail server | 25

INSECURE_PORT | port to use for http | none (defaults to 80)

SECURE_PORT | port to use for https | none (default to 443)

DEFAULT_HOSTNAME* | hostname for the default URL | none

SECURE_HOSTNAME* | hostname for client certificate authentication | none

TVERIFY_HOSTNAME* | hostname for tverify | none

MODE* | Flag to indicate that the code is working in Production or Development

one of DEV, TEST or PROD

'MX_WHITELIST' * | Comma-separated list of domain names that will not be checked for MX connectivity.

For example "example.com,cacert.org" Commas only, no spaces.

Environment variables marked with an asterisk (*) need to be defined explicitly.

SetEnv MYSQL_WEBDB_DATABASE cacert
SetEnv MYSQL_WEBDB_HOSTNAME localhost
SetEnv MYSQL_WEBDB_PASSWORD anotherhardpassword
SetEnv MYSQL_WEBDB_USER cacertapplication
SetEnv RETURN_ADDRESS root
SetEnv SMTP_HOST localhost
SetEnv CSR_DIRECTORY /tmp/csr
SetEnv CRT_DIRECTORY /tmp/crt
SetEnv DEFAULT_HOSTNAME cacert-test.local
SetEnv SECURE_HOSTNAME secure.cacert-test.local
SetEnv TVERIFY_HOSTNAME cacert-test.local

SetEnv MODE DEV
SetEnv MX_WHITELIST cacert.org,example.com