On Thu, Nov 11, 1999 at 07:14:37AM +0800, Edward Castillo-Jakosalem wrote:
> > Is it always the same hosts(s)?
>
> Mostly free web email services like hotmail, yahoo, and mailcity.
Then maybe their mailserver are overloaded.
> You think the cause is the delay between the connection of their servers and ours?
No. If you have a message M(a) that should be delivered to host H.
Host H is down. So qmail backs off the message for some time. It tries
again, fails to send, backs off again. The retry time grows quadratic.
This means that after some unsuccessful retries qmail may wait an hour or
more before it does the next retry.
Now the mailserver is ready again. You send a new message M(b). This
message goes through immediately, but message M(a) may have been scheduled
for retry e.g. 40 minutes later.
So the new message goes through immediately, but the elder one will
go through after 40 minutes (if the remote host is still up).
This is on purpose as to not overload a mailserver that came up recently,
immediately again.
\Maex
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