>> I find this implausible because the top four points would be the
>> same if I were using the provider-provided software on Wintel - and
>> anything that broke mail fetching for that crowd would be fixed
>> approximately instantly.  (However, the provider's mailhost *does*
>> appear to be trying to do PMTU-D; the packets I do see have DF set.)

> what kind of MSS value does GatesOS box uses?

I have no idea; for all I know it may not even do TCPOPT_MAXSEG.

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