RE: [IMail Forum] telnet port 25 security question

[Hermann Strassner]

If you can connect, there is a mail exchanger with SMTP service running for that host. If you can�t connect, there is no SMTP service running, or it is not available to the outer world.   If you are able to send mails to that domain there has to be a SMTP service listening. You can connect to this service even with telnet.   Hermann -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Arriba-R1 Sent: Monday, January 29, 2001 9:32 AM To: [EMAIL PROTECTED] Subject: [IMail Forum] telnet port 25 security question Hello,   I've recently read that one can use "telnet www.thedomainname.com 25" in order to troubleshoot smtp mail problems.   I noticed that doing this with some domains yields a response of the smtp server name and software version.   On other domains such as amazon, or microsoft, there is a failure to connect message.   Is the ability to successfully telnet to port 25 a security issue?    Thanks Kim