Feature Request: enable pattern matching/regex when adding domains to blacklist

User need: We are receiving 60+ spam emails a day from the domain @qq.com. We don't want to block all e-mails from @qq.com as many of them are legitimate but we do want to block the spam. The spam all contain the same pattern in their e-mail address: 1111111111@qq.com, where 1 represents a number. We want to block all e-mails following this pattern for this domain.

Potential solution: allow regex patterns when adding domains to the blacklist e.g:

^[0-9]*@gg.com