Am 02.10.2012 11:23, schrieb Tom Kinghorn:
> On 02/10/2012 11:21, Robert Schetterer wrote:
>> guess this might be better
>>
>> check_recipient_mx_access type:table
>>     Search the specified access(5) database for the MX hosts for the
>> RCPT TO domain, and execute the corresponding action. Note: a result of
>> "OK" is not allowed for safety reasons. Instead, use DUNNO in order to
>> exclude specific hosts from blacklists. This feature is available in
>> Postfix 2.1 and later.
>>
>> but i am still not sure if this is working
> Thanks to all who have responded.
> 
> I will test and report back on any successes.
> 
> Regards
> Tom

if played with my test setup
and this seems to work
but however i dont recommend it as a good idea yet
until gurus gave their toughts

master.cf
...
slow unix  -       -       n       -       -       smtp

main.cf

i.e

slow_destination_concurrency_limit = 3
slow_destination_rate_delay = 1s
slow_destination_recipient_limit = 6

smtpd_recipient_restrictions = permit_mynetworks,
                              ...
                              permit_sasl_authenticated,
                              ...
                              reject_unauth_destination

smtpd_data_restrictions = check_recipient_mx_access
hash:/etc/postfix/check_recipient_mx_access

i.e with gmx

/etc/postfix/check_recipient_mx_access

mx0.gmx.net FILTER slow:mx0.gmx.net
mx1.gmx.net FILTER slow:mx1.gmx.net

-- 
Best Regards
MfG Robert Schetterer

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