Email sending do not work

[Tue]

Log what the server reply is:

Code:

res, err = mail('TEST@InoDes.dk', subject, message)
log(res, err)

This is the reply, what do that mean?

Code:

Postkasse post ind 20.08.2020 11:21:26
* arg: 1
  * nil
* arg: 2
  * string: Try again