> hi list,
> Under MAIL EXCHANGER POLICY TESTS
> i see this:
> By listening on both primary and backup MX addresses,
As the text says, for this feature to work, postscreen listens on
both the primary and the backup IP address.
If the primary and the backup IP address belong to different MTAs,
these MTAs would have to share the postscreen cache; currently,
that is supported only with memcache databases.
Cache sharing between MTAs has obvious scaling limits. The MX
exchanger policy enforcement feature is not meant for large
corporate networks. It works well for small sites like mine.