2 May
2013
2 May
'13
5:09 a.m.
Thanks to all who have responded so far for the informative and insightful comments. This will certainly help when the issue arises for discussion again. There are no non-technical end-users of machines whose administrators are likely to discuss this with me, and all of the people involved use Linux mailers, so I am spared some of the complexities that have been discussed. As to my own set-up, Postfix rejects most of the spam during the SMTP negotiation (I have various standard checks in place), and CRM114 catches almost all the rest as part of my Procmail configuration. I haven't implemented grey-listing but I know people who have found it very effective. Block lists are also included in my Postfix configuration.