Type of connection for sendind emails

Hello,

I have a problem with outgoing emails in Sourcing 9.0. It seams that the connected SMTP server does not accept authenticated connections and Sourcing is forcing this kind of connection. This results in breaking off the connection between Sourcing and SMTP server and the emails are not being delivered to recipients. In Sourcing the emails have status SENT and are in the Processed Messages report, so the sending functionality works fine.

Is there any way to change the type of connection that Sourcing uses for sending emails? If so, where can I find theses settings?

Regards,

Kamil