SDP: Mail not sent (notifications from the SDP interface)

SDP: Mail not sent (notifications from the SDP interface)

Hello.

     SDP version 9.4.9421 is installed. Configured to send outgoing mail. SMTP protocol, port 25. When sending a message via the SDP interface, we receive the message "Failed to send notification".

     What could be the reason? Decision?

Sincerely.
Igor Stepanenko.

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