On Fri, 23 Jul 1993 16:13:31 CST Bill Harvey <[log in to unmask]> said: >On Fri, 23 Jul 1993 15:49:13 EDT, John Arnfield > <[log in to unmask]> said: >>I have recently been asked to enter a subscription for a person using an IP >>number address, i.e. of the form >> userid@[141.65.128.48] > >This is a valid address. LMAIL, LISTSERV's DIST protocol, XMAILER, >and IBM's SMTP (for VM) all support this format. (I don't have access >to SMTP for MVS, so couldn't test it, but I'm pretty sure it does too.) Indeed it is a valid address, but it is not formally supported by LMail or LISTSERV. There are configuration cases where it will works, and in other cases it may not work (for instance, with LMail this only works if you have a default entry in the domains table). This is some sort of anachronism which was furthermore designed for temporary/debugging reasons. For instance, if I am setting up a new host and run into problems, that is one way of sending mail to the person in charge of that machine even though the name server is broken (another is to telnet to his SMTP port). It is even less appropriate for inclusion in a mailing list than a source route, and LISTSERV does not support source routes (LMail does, because they are very useful for routing things around, which is part of LMail's job). Eric