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Re: 2821bis consideration - New 2nd attempt Retry Strategy recommendation

2007-11-15 16:48:46

At 5:58 pm -0500 15/11/2007, Hector Santos wrote:

Is there worth to this?

My recommendation for 2821bis is to include some insights about or how variable strategies" plays a bigger role these days and in fact, might be almost an "necessity" for improved modern operations these days.

Even if one didn't want to incorporate GL into their SMTP receiver, the default sending retry strategy (if it matches the current specs) has to be reconsidered due to increased remote GL systems and the growing probability of hitting such a system.

In short, they might be need to reconsider the recommended "30 minute" retry interval, at least for the 2nd attempt.

I recommend a 5 min retry on the 2nd attempt, with a fall back to their normal interval after that.

My MTA has a default graylisting delay of 25 minutes. 25 minutes was chosen because it wouldn't unnecessarily delay for hosts that use the recommended 30 minute retry, and because at the time I saw a significant number of what appeared to be bots that were retrying 5 times 5 minutes apart (~20 minutes between the first and last retry).


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