Socket closes unexpectedly

[vladtreny]

Describe the bug Hello, I am not user, but sender to this server.

And I see in the logs, that the server hangs here.

Last logs '250 recipient <****> OK', '354 go ahead, make my day'

After that, I start writing data to socket and it closes, instead of further communicating. I've never seen this issue on other servers.

Expected behavior Receive error if something failed

Observed behavior Socket just closes after writing to it

System Info: ESMTP Haraka/2.8.20 ready