>Recently I was alerted byORBS.ORG that my site had been identified as being >an email relay site, i.e. it could be used by spammers to relay messages to >other sites. I plugged up all the holes, including an empty from address >which >ORBS.ORG tests for, since many spammers don't include a FROM address. > >However, an unexpected result of this was that I no longer could receive mail >from the LISTSERV account. This is because it sends a blank address in the >MAIL FROM: command in the SMTP protocol. I.e.: > >MAIL FROM:<> > >A real address is specified in the message header itself. I believe that >more and more people are going to testing for this situation. Is there a way >to correct LISTSERV to specify the address in the MAIL FROM: command also? >Thanks. > >Mark Read RFC821 before you ask for this type of thing. An empty From, e.g. From: <> violates RFC822 and is a pretty sure sign of either a spammer or a broken mailer, but an empty MAIL FROM: MAIL FROM: <> is not only allowed but is generally required in a situation where you don't want bounces to go to any addresses. (For instance, a bounce message itself generally will have an empty MAIL FROM to avoid mail loops.) I suggest you correct your MTA's broken configuration. -jwgh