On 02/16/2012 12:13 PM, Dipl.-Ing. Juergen Ladstaetter wrote:
yet. Is there any way to configure postfix to always make MX record DNS
lookups, or is the only way through a second postfix instance that has no
localdomains specified?
Even with two instances you could have problems.
For example, your users might have aliases that get expanded on the
incoming instance, where the maps are controlled by customers. If one of
your customers sets up example.com, and has u...@example.com aliased to
u...@example.net hosted elsewhere, they could be open to another
customer stealing the example.net mail.
One instance per customer is /probably/ safe, but I wouldn't swear to it
without some more thought.
