Exim wrote: > I just had a client ask for something I haven't done. He wants emails from > unknown users to be sent back with a "are you human" request they must > respond to correctly. If they do, then they will be automatically added to > a list of valid senders. >
I believe it is called challenge response filtering and it is the most horrible antispam tactic I have seen. If you really absolutely can not get out of doing it, please make sure that you do it as a last resort, check SPF, run SA, use DNSBLs. Plain old bounce backscatter is a little annoying but you can forgive it on the grounds that that is how email was originally designed to work, but these challenge things are pure arrogance "My time is so important that rather than just clicking delete I am going to waste *your* time by making you filter my messages for me and while I'm at it I will increase the number of junk messages floating around the internet". If I was a customer of anyone who thought like that, I would do my best to take my business else where. *Michael Heydon - IT Administrator * [email protected] <mailto:[email protected]> -- ## List details at http://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
