On Mon, Dec 14, 2015 at 01:41:46PM +0000, Lee Fuller wrote:
Hey there, I checked your email address using basic telnet and a measurement tool. I identified the likely physicality of your mailbox to be Cincinnati, and the server connecting to you in these measurements is in Texas. I ran the test in a handful of arrangements but I repeated the general routine enough times intentionally to discount causes of likely performance fluctuation.In both tests it is clear that an SMTP transaction takes as long as 10 seconds to conclude, and that is using plaintext SMTP without actually havingtransferred anything more than a formal greeting of machines. I doubt a list server of this size is configured to wait anywhere near 10 seconds before considering an address unreachable.
RFC 5321, section 4.5.3.2 lists the various timesouts that an SMTP client SHOULD employ (noting that they MUST be per-command, not on the whole transaction). They include:
* Time to Initial 220 message: 5 minutes * Response to MAIL or RCPT command: 5 minutes * Waiting for "354 Start Input" after issueing "DATA": 3 minutes * Waiting for next command from server: 5 minutesSo, any client that disconnects after waiting only 10 seconds is, while not explicitly spammy, at least poorly behaved.
That's probably the cause of your issues as you describe them. - - Lee Fuller
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