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Elias

Yahoo Greylisting - Emails Delayed

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Starting sometime in the last week, Yahoo has implemented some sort of greylisting for its Yahoo Mail service. Unlike normal greylisting implementations which usually only greylists an IP address once, Yahoo appears to be greylisting every single email that is sent to them.

 

Unfortunately, with the volume of email we send to Yahoo everyday (and especially on Thursdays with the new cache notification emailer), when our mail server retries to send all the deferred email, we're being hit with Yahoo's rate controls which are delaying all those messages further. So while normal greylisting should only cause email delays of ~15 minutes or so, we currently have an enormous queue of email that's been delayed for over 8 hours.

 

I'll attempt to contact Yahoo to see if they have some sort of whitelist we can be added to. But based on reports from other mail administrators around the net, I'm not anticipating much help from Yahoo and I don't expect this problem to be solved soon.

 

I'll post an update here when more information becomes available.

 

:laughing: Elias

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