RBL & greylisting on Ubuntu.com smtp

[Tollef Fog Heen]

* Scott Dier 

| I've seen mails be delayed by 12 hours or more due to greylisting
| and address verification combined with lamely configured mail MX
| clusters. (if you don't share the greylist between a setup of 5 MX
| servers, you shall configure it, now. really.)

Which is why greylisting on the /24 netblock instead of the exact ip
address usually is a good choice.  Most mail server farms seem to live
on the same subnet.

-- 
Tollef Fog Heen                                                        ,''`.
UNIX is user friendly, it's just picky about who its friends are      : :' :
                                                                      `. `' 
                                                                        `-