Question regarding the nature of the whitelist

======== Required information ====
- iRedMail version: mail_version = 0.8.6
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Linux/BSD distribution name and version: CentOS 6.5
- Related log if you're reporting an issue: N/A
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I was curious, if a domain is added to the whitelist does this mean that all mail from that domain is passed into the system no matter what?

Also does this whitelist/blacklist system support wildcards? For example would the following block all mail from any domain ending in .eu if entered into the blacklist section?

@*.eu