On 14/11/2017 16:51, Jeremy Harris wrote:
On 14/11/17 13:16, Vladimir Dubrovin via mailop wrote:Timeout after "." on smaller messages and in the middle of transmission on large-size messages usually mean TCP connection issues, most common reason is PMTUD blackhole router problem.On any size message they can be due to a too-small timeout on the client end (five _minutes_ per standards, I think) and content scanning done on the server end (the content not being available for scan until it has all arrived).
Actually, it's way more than that: Initial 220 Message: 5 Minutes MAIL Command: 5 Minutes RCPT Command: 5 Minutes DATA Initiation: 2 MinutesData Block: 3 Minutes. This is while awaiting the completion of each TCP SEND call transmitting a chunk of data.
DATA Termination: 10 MinutesSo the minimum timeout for 1 message is about 30 minutes. That said, many systems don't wait that long, unfortunately.
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