On 29.08.19 10:36, Eliza wrote:
I know postfix returns 4xx Response Code for Temporarily Deferred, as below:
- The following addresses had fatal errors -
[Status: Error, Address: , ResponseCode 421,
4.7.0 Temporarily Deferred]
Message will be retried for 4 more day(s)
this happens
on 2019/8/29 16:50, @lbutlr wrote:
Only if you were very careful monitor your system for the many many corporate
sanders where greylist was the effective equivalent of a blacklist (those that
did not retry in violation of RFCs and this that had many servers and would
resend from different
On 28 Aug 2019, at 21:06, Doug Hardie wrote:
> Greylisting used to be a very effective approach to spam blocking.
Only if you were very careful monitor your system for the many many corporate
sanders where greylist was the effective equivalent of a blacklist (those that
did not retry in
