Thx Terry for your answer, but ... The reason why I posted this question was because ordb.org sent my mail-system a mail-message containing <to: '[EMAIL PROTECTED]'> to check for open relay. So basically ordb.org is checking for 'built-in' rfc features? How can xmail be altered to prohibit this functionality? (Most easy way is to filter ordb.org messages -> they don't receive a answer so mail-server = not an open relay hihi) No seriously; they are doing a great job, so we should support them as long as our systems are not being stated 'open-relay'. With this test all MTA would be seen as 'open relay'. Am I right?
Frederik > -----Oorspronkelijk bericht----- > Van: Terry L Fritts [mailto:tfritts@;smartbusiness.com] > Verzonden: maandag 28 oktober 2002 13:12 > Aan: Frederik Gallon > Onderwerp: [xmail] Re: Mail server Basics > > > > Hello Frederik, > > Monday, October 28, 2002 you wrote: > FG>> [EMAIL PROTECTED] > LT > This used to be a sendmail feature > > Not just sendmail and often other characters can be used instead of > the "%" sign. You would be an open relay if user%users-domain > received the message. > > Often the open relay tests will attempt to send this kind of > message through one of you secondary MX servers. The idea is that > the secondary will receive the message because it is a backup for > "mydomain.be" in this case. Then it will forward the message on to > mydomain.be which will parse the message and attempt relay or local > delivery to "user%users-domain". The more legitimate use is for > local delivery to another user at the same or another local domain. > So in that way it is a useful feature. > > Usually this will not relay (that is to outside domains) unless the > primary is allowing relay from the secondary. But sometimes if each > server is set to provide backup for the other they each will be set > to allow relaying for the other or if they are in the same network > then relaying is often permitted. So in those cases the test > succeeds and the server is declared an open relay. > > > Terry Fritts > Smart Business Solutions, Inc. > > - > 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]
