MAPS sucks – Tony Finch

We use the JANET subscription to the MAPS RBL+. It is a frequent source of false positives which causes a great deal of irritation.

Their RSS (relay spam stopper, i.e. list of open relays) does not have any re-testing nor any expiration of old entries, so is full of shockingly stale entries.
Their DUL (dynamic user list, i.e. list of home computer IP addresses) has many errors. They do not track re-assignments of address space which caused them to list gmail's servers earlier this year.
Spamhaus's ZEN list is just as effective but much more trouble-free. Why is JANET paying for the RBL+ and not ZEN?
They do not accept corrections from their paying customers. WTF!

Sadly I can't easily ditch the RBL+ since using both it and ZEN adds 20-25% to our block rate compared to either alone, so performance would suffer horribly. Also, I don't want to get into the game of maintaining my own blacklist and/or whitelist - a time sink I do not need.