Am 05.04.2014 10:47, schrieb Anders Melchiorsen:
> We have some trouble delivering mail to a particular destination. After 
> something 
> like five deliveries in a few seconds, our IP packets are dropped for one 
> hour.

if that is true forget it to seeek for workariunds on your site
and contact the syadmin on the other side and explain him that
he is a fool

* he has to reject with a 4xx response if you are over rate-limits
* he has at least to REJECT packets instead to DROP if he is doing
  that with iptables and a irresponsible rate limit
* he has to reconsider the irresponsible to not say laughable limits

you can't work around every broken server out there

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