Curtis H. Wilbar Jr.:
> 
> Running a Postfix 2.2 server...
> 
> The server won't accept [email protected]@ourserver.com
> 
> But, it is accepting @somewhereelse.com:[email protected]

This is historical syntax, and is deprecated.

For compatibility, Postfix accepts the syntax and processes it as
if the client had sent "[email protected]" instead.

> We will be upgrading Postfix soon, but in the meantime, how do I best
> block this ?

It is harmless.

        Wietse

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