Kelly Jones wrote: > To fight spam, I want to validate the address (not necessarily in > real-time) of the a given email sender. Is there a Unix tool that does > this? [snip]
There are many milters that do exactly that (example http://www.snertsoft.com/sendmail/milter-sender/). Of course milters are for sendmail or postfix, you may need something similar for other servers. -- René Berber
