Re: reply length 5303 > buffer length 4096 ?

On Wed, Jan 19, 2005 at 03:30:36PM -0500, Wietse Venema wrote:

> How did you arrive at the number of 5? This would be the number
> of MX addresses that Postfix will use from the MX lookup. If all
> addresses are dead then no mail goes through, even if the 6th MX
> address is OK.
>

I think we arrived at a number in the five to 10 range on the assumption
that all hosts time out, and some tuning to handle plausible deferred
queue sizes. The hand-waving arguments are in the archives. The key factor
is of course latency, so indeed we want a total connect timeout budget
for each delivery, and if MX hosts refuse service, one can try them all,
while timeouts would lead to fewer MX hosts being tried... In practice
I don't think that moving the limit into the time domain is necessary...

--
Viktor.

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