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).
-- 
Cheers,
  Jeremy


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