Thanks! I'm doing it right now ... Jeff
Sönke Ruempler wrote: >Jeff, > >On 17.07.2005 23:10, Jeff Buehler wrote: > > >>Thanks, Sönke - >> >>I was hoping to keep them in the queue for awhile, but I am collecting >>500 or more undeliverables a day presently since I am forwarding to a >>domain that is getting heavily spammed. >> >>When spammers send spam to bogus users at the busy Exchange server I am >>forwarding to, it predicatably sends back the "user doesn't exist" >>message, then xmail correctly attempts to send that back to the spammer >>who, of course, doesn't accept incoming mail, and so the message is >>undelivered. >> >>Are you aeware of a better way to handle this sort of interaction? I >>could create a user to match every user on the Exchange server and at >>least cut out a hop, but XMail will still then try to send the "no user >>by that name" reply back to the spammer. I guess it's important to >>notify valid senders to the domain that a given user doesn't exist, >>though... Is that an RFC requirement? >> >> > >My solution is to setup a cmdaliases file for each user that is being >forwarded. So your mail server does not send bogus bounce mails into the >internet. It's quite simple because XMail then sends directly "550 user >not found" in the SMTP session. So there is _NO_ bounce mail generated >and your Exchange server gets only these messages that it can handle. > >And if there is a non-spam sender that types a wrong mail adress he'll >get a bounce message from the server that tries to send to yours. > >I hope you got the advantage of that way. > >And note: Some providers are blacklisting servers with high bounce >volumes. So someone - aware or unaware - could exploit your mailserver >with wrong sender addresses and wrong rcpt addresses. now your >mailserver weirdly sends out bounces back to the faked sender mailserver >and could get blacklisted. > >So it's always a good idea to use forwarding for each user and not for >whole domains. That differs the lame admins from the good ones *SCNR* >- >To unsubscribe from this list: send the line "unsubscribe xmail" in >the body of a message to [EMAIL PROTECTED] >For general help: send the line "help" in the body of a message to >[EMAIL PROTECTED] > > > > - To unsubscribe from this list: send the line "unsubscribe xmail" in the body of a message to [EMAIL PROTECTED] For general help: send the line "help" in the body of a message to [EMAIL PROTECTED]
