KumoMTA internal: failed to send message: Timed Out sending message payload data

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1

What could this possibly mean?

3

data_timeout was reached while sending the DATA portion of the SMTP transaction to the destination. It points to a networking issue of some kind; the data did not fully send through the networking stack in your kernel for whatever reason, within the configured timeout. This timeout is triggered in the write path, before we attempt to read the response from the peer.

4

Hmm odd. 30s is enough to send a few KBs

5

oh well..