OT: Ebay spam got me thinking

[Matt Hampton]

Replying to self!

> joe.bloggs at bank.com	ALLOW
> jane.smith at bank.com	ALLOW
> support at bank.com	RESTRICT
> support*@bank.com	RESTRICT

The last one wouldn't work as the number of DNS lookups could be the
maximum of the number of the number of characters in the email address.

I think it should be

@bank.com	ALLOW
support at bank.com	RESTRICT

The use of subdomains could be used to make this more scalable

e.g.

@support.bank.com	RESTRICT

matt