On Fri, Feb 06, 2004 at 05:57:17PM +0300, Rudolf A. A. wrote: > Hello, > > I have a question about sendmail and mail in general. > > I want to know is it possible to know if there are some specific users > in some specific servers. In general, this is not possible. For example, on my work system, the incoming mail hits a Linux system on the outside, gets rerouted to another Linux system on the inside, and then if it doesn't know anything about the user, gets sent over to MS Exchange. If Exchange doesn't know about the address, the mail bounces. The key thing is that the e-mail server you talk to (the first Linux system) has no knowledge of me at all - it just assumes the e-mail is valid and passes it on. > Or without sending email to him, how can I know, is there a such user > ivantan@xxxxxxxxxxx ?. Even by sending e-mail to him, you don't really know. The mail may be quietly dropped in the bit bucket on the receiving system, or it may be automatically processed by some software application. It may be forwarded to another external e-mail address which may or may not bounce the message. In some cases, you can ask the receiving MTA if the user is valid and it may tell you. In many cases, however, there's no way to know. -- Ed Wilts, Mounds View, MN, USA mailto:ewilts@xxxxxxxxxx Member #1, Red Hat Community Ambassador Program -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
