We've recently deployed a Cisco Spam & Virus Blocker in our network. Currently we're sending a good amount of email traffic to it (~10k emails / hour), all seems to be going very well.
For redundancy all our domains are configured with two MX records:
MX10: (the cisco blocker)
MX100: (a seperate fallback server)
The MX10 normally grabs all the email, but some spammers tend to send email directly to the MX100 (our fallback server), which then forwards it to the Cisco Blocker. I've configured our MX100 as an Incoming Relay, with the following details:
IP: (the IP of the server)
Parse After: from
I'm hoping for some input on wether this is the correct setup, as I don't want my fallback server to get a negative reputation score in SenderBase for obvious reasons.
The fallback server is not between any firewalls, and relays mail directly to the Cisco Blocker once it's received.
Thanks for any input!
Is it working yet as hoped? Depending on the MTA & headers this does vary some what and can take some trial & error to get working.
Your config look correct from a first glance - however from experience mail server configurations can vary hugely.
Does your Fallback Server use the same IP-Address to receive and to deliver e-mails? If it does of course you run the risk to lower the SBRS, because the Blocker tracks the IP Source Address of the incoming SMTP session to get a) the SBRS Score via DNS and b) to bind some statistics and reports them to SenderBase.