On Jul 31, 2010, at 11:22 AM, Hector Santos wrote:
J.D. Falk wrote:
It's not the wikipedia definition of greylisting, but they do use 4xx
replies to control the flow of inbound mail.
Ok, now I am starting to see 45x "grey listings", here is snap shot of a mail
There are multiple retries spread across different machines.
Do you think they need the same exact IP or they support a class C
Yahoo isn't greylisting.
"Yahoo is not keeping track of the mail it rejects and is not reliably allowing
email through on the second attempt. There are a couple reasons why Yahoo is
• Shedding load in a generic and non-specific way.
• Shedding load by temporarily refusing mail from specific IPs.
In the first case, the shedding of load means nothing more than Yahoo is
shedding load. There is not really anything the sender can do to compensate for
this, nor is there any thing the sender is doing (except possibly send mail to
Yahoo at the same time as the rest of the world) to precipitate the blocking."
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