>> You will probably want to put a little effort into maintaining lists >> of regular correspondents who can bypass greylisting. There may be >> tools to automate that, e.g. to whitelist someone a local user has >> sent mail to. > > Has anyone looked into the use of a DNS-based white listing service? > > For example: http://www.dnswl.org/ > > It might be interesting to make a pass over a grey list database > and see if the sites white listed there appear in the registry. > And that sites that were black listed or simply did not retry > are _not_ listed in the white list.
Been using it at least couple years to bypass greylisting. Seems to give no negative impact. Be sure to add the IP of your servers there.
