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 w
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 o
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 violat
on 2019/8/29 11:30, Bill Cole wrote:
Which is their absolute right to do for whatever reason they see fit. It
is NOT "abuse" in any sense.
Andrew didn't mention the enhanced status codes of RFC3463, which
include the '4.7.0' you are seeing in error messages. That is a generic,
intentionall
On 28 Aug 2019, at 22:50, Eliza wrote:
Hello,
on 2019/8/29 10:42, Andrew Bernard wrote:
421 Temporary System Problem. Try again later.
421 Try again later, closing connection.
421 Server busy, try again later.
The SMTP error 421 is normally used for temporary problems on the
mail server or a
> On 28 August 2019, at 19:50, Eliza wrote:
>
> Hello,
>
> on 2019/8/29 10:42, Andrew Bernard wrote:
>> 421 Temporary System Problem. Try again later.
>> 421 Try again later, closing connection.
>> 421 Server busy, try again later.
>> The SMTP error 421 is normally used for temporary problems on
Hello,
on 2019/8/29 10:42, Andrew Bernard wrote:
421 Temporary System Problem. Try again later.
421 Try again later, closing connection.
421 Server busy, try again later.
The SMTP error 421 is normally used for temporary problems on the mail
server or a problem with the recipients email accoun
Hi,
Here's an extract from a site about 421:
SMTP Error 421
421 Temporary System Problem. Try again later.
421 Try again later, closing connection.
421 Server busy, try again later.
The SMTP error 421 is normally used for temporary problems on the mail
server or a problem with the recipie
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)
I don't like every MTA returns this 4xx code, t
