RobertH wrote:
If the recipient is bad then no one would have got the email
anyway. But there wouldn't a a notification to the sender. I
suppose I could make it smarter so that if the message is
blessed in one of my many white lists then I would do a
bounce message, otherwise not.
OTOH, if someone is rarely down then the backscatter would
probably be minimal. This will probably be something to
experiment with.
to do it properly, you must check for "validrcptto"
therefore, you must sync user databases with the main email server for each
domain...
I'm already in the front end spam filtering business and if the
customer's server goes down my system already acts as an MX backup. So
the way I see it to be just a backup is about the same configuration
except that I'm not the lowest MX. So in theory it should be trivial.
I'm just adding a few rules like not using Spamassassin on those domains
and just using my Exim rules. So unless I'm missing something this
should be a trivial change. And they will see a significant drop in spam
and that might get people interested in full service. But even for free
it helps build my lists.
