Last month when I raised this issue, I said that I would collect some stats on whether the use of 'nolisting' was of any significant benefit. These numbers were collected from the first 18 days of Jan 2008 and the same period in Feb 2008. The numbers are as reported by logwatch's postfix analysis of the mail logs on the two servers. Accepted Rejected Total Primary - Jan 42542(2.49%) 1663404(97.51%) 1705946 Secondary - Jan 33479(7%) 444991(93%) 478770 Primary - Feb 147858(39.9%) 222478(60.07%) 370336 Secondary - Feb 26767(8.4%) 293800(91.65%) 320567 There was a significantly higher proportion of mail accepted by the primary in Feb but that could be that many of our clients might have been on holiday in January. I believe that the large reduction in the mail being rejected by postfix on the primary MX is a pretty good indicator that there still are a large number of spambots that only try the primary MX. Nolisting is NOT the cure for spam but as another layer in a multi-layered defense, it seems to be pretty effective. But as always YMMV. I am also aware that as a part of any solution it may not have a long lifetime but for the moment we are going to leave it turned on. Glen.