On 4/17/23 22:19, tom--- via Postfix-users wrote:
I saw many peer MTA connecting me with this default HELO hostname:
localhost.localdomain.
is this a FQDN? is it valid?

No properly configured MTA should ever be advertising its identity as localhost.localdomain. Assuming it is that literal string, that looks like AT BEST a half-configured MTA, possibly on a half-configured host.


--
  Phil Stracchino
  Babylon Communications
  ph...@caerllewys.net
  p...@co.ordinate.org
  Landline: +1.603.293.8485
  Mobile:   +1.603.998.6958

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