Does this new feature whitelist your own users on that server? I don't mind blocking incoming from 3rd parties listed but not block my own from sending.
I noticed a problem with the zen rbl.
It includes the PBL list also, and that is not a list you want to block.
PBL is just a 'warning' saying the ISP's Policy bans users from using external mailservers.
So, if you have a user using your server for outgoing mail, instead of their ISP, their IP is listed in the PBL.
I don't think we should be using the 'zen' version of spamhaus RBL. the SBL+XBL version has always been good for me.
From Spamhaus website:
How to use the PBL
The PBL can be queried directly as pbl.spamhaus.org and is also integrated into zen.spamhaus.org (do not query both, use either one or the other). We recommend you use zen.spamhaus.org which combines all of the Spamhaus zones, see: ZEN.
Caution: Because the PBL lists normal customer IP space, do not use PBL on smarthosts or SMTP AUTH outbound servers for your own customers (or you risk blocking your own customers if their dynamic IPs are in the PBL). Do not use PBL in filters that do any ‘deep parsing’ of Received headers, or for other than checking IP addresses that hand off to your mailservers.
Should I use the PBL to block access to my webserver?
No! A listing in the PBL does not mean there is anything 'wrong' with the IP address or end user. A PBL listing does not mean an address is an open proxy or run by a spammer. All it means is that the IP address has been designated as 'not allowed to make direct-to-MX SMTP connections'. The majority of legitimate connections to webservers come from IPs listed in PBL. Please do not block innocent users.