KnowDB

port

587 (submission)

See also: software postfix

Port 587 (submission): SMTP submission, email submission from clients.

Port 587 is open on 5 hosts in your infrastructure, across 4 operating systems.

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%