Hi On Tue, 31 Oct 2000, Heiko Rother wrote:
Am Mon, 30 Oct 2000 23:23:59 schrieb SYSTEM-LOGGER: [syslog@machine.domain: Oct 30 22:23:59 www sendmail[21250]: NOQUEUE: SYSERR: putoutmsg ([xx.xx.xx.xx]): error on output channel sending "220 machine.domain ESMTP Sendmail 8.9.3/8.9.3; Mon, 30 Oct 2000 22:23:59 GMT": Broken pipe]
Hello,
I received the mentioned message from one of our mail servers. Does anybody know, what has happened there? Did someone succeed in exploiting one of Sendmail's uncounted weaknesses?
Don't worry, this looks like a simple connection failure. Someone (mail client or server) set up a connection to your machine, which then replied by sending a 220 machine address, which did not get through. Try connecting to your mailserver via telnet (telnet you.mail.server 25), you'll get a welcome message saying just that (220 your.machine.name ESMTP Sendmail version etc). Your machine sent that, but couldn't get it through. Could be anything from the remote machine going down to a router hickup somewhere along the line.
Greets,
Heiko
-- Heiko Rother -- CM Systemhaus GmbH, Hannover, Abt. Online-Medien
Stefan