[defanor]

I missed an incoming message (fortunately an unimportant one) from Amazon SES recently, since its 54.240.27.30 address was listed by bl.spamcop.net: Amazon kept trying different addresses while running into greylisting, until it tried that address and was rejected. Possibly it is less of an issue when sending between large providers (e.g., Amazon to Gmail), but apparently still not a perfect solution to ensure message delivery.

[dugite-code]

Sure but it really highlights that even big providers get black balled at seemingly random. I've had an email from a Microsoft email address come up in a spam list before. No one is safe.