Greylisting -- Was: Anti Spam
mnslinky at gmail.com
Sun Apr 29 13:00:42 UTC 2007
On Apr 29, 2007, at 4:00 AMApr 29, 2007, Ted Mittelstaedt wrote:
> If the monitoring system notices something down, I have to know about
> it within a few minutes. I cannot wait for the mailserver that
> sends the
> page out to retry sending the page to the cell carrier's mailserver
> in an hour.
> Things go down rarely. The moonitoring system is not continually
> out pages to my cell phone every day. Many times many months will
> in between the monitoring system sending my cell phone a page. If the
> cell phone company was running greylisting, any whitelist entry for my
> monitoring system would be gone by then.
>> Even if it does take an hour, the fact that it retried the server on
>> the other side doing the greylisting means it would be whitelisted
>> after a couple mails.
> But the whitelist would have expired by the next time there was a
>> If you're doing something SO critical that
>> three or four mails delayed an hour, until you're establishes as a
>> legit user, means life or death, you definitely should be doing
>> something that backs up how you communicate with other sites,
> I'm monitoring systems at the ISP I work at. No, it is not life or
> if a feed goes down for 3 hours and a bunch of people cannot download
> their daily freebsd-questions mailing list fix. At least, I don't
> so. But they do. And as their money that buys the ISP's product puts
> the bread on my table, I have to do what they want. And they want
> response if there is a problem in the ISP's systems. That won't
> happen if
> the monitoring system's e-mails that get sent out when there is a
> lie around in a mail queue for an hour waiting for a greylist at the
> cell company to let the messages through.
My ISP has a FreeBSD with a GSM modem with text messaging service.
They send actual text messages across the cellular network -
instantly. No email required. Perhaps you folks could do that?
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