Alan Remos writes: "Ever since updating to Mac OS X 10.1.5, I have had problems sending out emails through Verizon (who now requires SMTP authentication when sending out mail). I eventually found out ...
PMTUD and MSS rewrite can mitigate this problem in most instances, but it's still not ideal to rely on them. I've always strongly recommended customers to set the MTU values on their workstations low ...
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