KnowDB

port

25 (smtp)

See also: software postfix

Port 25 (smtp): SMTP, sending email between mail servers.

Port 25 is open on 5 hosts in your infrastructure, across 4 operating systems.

Read more: "Simple Mail Transfer Protocol" on Wikipedia, rfc-editor.org/rfc/rfc5321

Operating systems of the hosts listening to this port:

Ubuntu 22: 2 hosts (40%)RHEL 9: 1 host (20%)Ubuntu 24: 1 host (20%)Windows 2016: 1 host (20%)
  1. Ubuntu 222 hosts, 40%
  2. RHEL 91 host, 20%
  3. Ubuntu 241 host, 20%
  4. Windows 20161 host, 20%