CurlsMBS as mail server connection

As some clients have issues using the mail server I address in a desktop project for sending feedback and crash reports, I am giving CurlSMBS a try which generally can handle proxy settings much better and uploads the data much faster. So far everything looks good.
But the last debug line I receive is a

Header received: 250 2.0.0 ok: queued as xxxxxxxx

Which is as far as it goes. Is there a way to tell the server not to queue but send data immediately via Curl?

No. That is how smtp works.

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Thank you. As it turns out, customer changed to a different mail server in the meantime which works reliably …