#15 Whitelist: Option to enable Domain whitelisting

[zwahri]

Hi,

the whitelist feature ist great, but I think it'd be even better if there was a way to whitelist whole domains.
Companys often have a lot of e-mails addresses from a single contractor, which would make whitelisting all of them a pain.

I think this should be a checkbox ["this is a domain match"] or a new input field (which allows only inputting a domain (without @, wich would be added internally), since enabling substring matches for E-mail adresses would likely lead to errors.