Yves Junqueira wrote: > In one of my implementations, I have a gateway that filters messages, > removing most spam and viruses, than redirect them to the appropriate > servers. Thus, I do not have a record of user accounts for those > domains. What usually happens is that I get messages for > "[EMAIL PROTECTED]", from "[EMAIL PROTECTED]", and after the > final server gets the message, it bounces to yahoo. > > I don't want to cause any trouble to other admins. I understand the > way that smtp works, and that I must issue DSN's for undelivered > messages. But is there any mixture of techniques to avoid bugging > yahoo or other servers? Or have I missed the idea of DSN's?
Figure out how to get a list of valid final recipients to your gateway- then that machine can reject recipients that doesn't exist. Further processing is up to the sending server- or, in the case of most spam and viruses, the spamware or virus SMTP engine (which most likely will just discard that recipient for that run). The details of how to get such a list to into your gateway's SMTP software depend on what your final delivery servers are running, and what you're running on your gateway. >From what you've described, you're stuck with one or more hideous SMTP systems like Exchange that insists on accepting everything before rejecting unknown users with a *new* message (rather than an SMTP rejection code) as the final server. -kgd -- "Sendmail administration is not black magic. There are legitimate technical reasons why it requires the sacrificing of a live chicken." - Unknown -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
