On Tue, Jul 25, 2017 at 04:59:39PM +0000, Kirk MacDonald wrote:
> In addition to what is mentioned in RFC2142, can anyone offer any
> resources (or "best practices") for what can be considered "restricted"
> email addresses/UIDs for a domain which offers mailbox service to the
> general public?

In addition to the excellent ideas already on the table, I suggest
disallowing the domain names of the top N sites (pick your flavor
of "top", pick your N), e.g., do not allow:

        ebay.com@
        amazon.com@
        google.com@

and so on.  There are many, MANY people out there who don't grasp the
difference between RHS and LHS of email addresses and will be fooled
by these.   You might also want to consider disallowing the domain
names sans the TLD, e.g., ebay@, amazon@, google@ for the same reason.

---rsk

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