Gig 601XL Builder wrote:

Well looking at Larry's message that he says he sent a cancel message
and the follow up message I think the difference was 4 minutes.

FWIW, I did not see Larry's original message, though I have no way of
telling whether the cancel was honored by T-Online or a server further
upstream.

What was the content, subject or msg-id of the test message you sent and
cancelled? I am not seeing an obvious "test, I will cancel this" message
from you.