Connection refused

I am trying to do an email notification test but getting a connection refused error.
I have entered by SMTP server IP address and other required details.
What could I be missing here?

Have you checked the information you provided is correct on a mail client like Outlook or Thunderbird?
Do the logs give you any extra information?
The machine running Passbolt has access to the machine where the mail server is running?

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The SMTP server is actually is on the same network as Passbolt - I have also tested email delivery which looks okay.

Have you tried the same config on a mail client and it works?
Maybe you forgot some parameters on your config. Can you paste the config masking the info?