Hi Bodin,

that's because of the blacklists - openser "learns" the failed destinations (like the 503 replied) and block them for some time (4 minutes) to prevent useless processing.

You can disable this auto-learning for blacklists:
   disable_dns_blacklist=yes

regards,
bogdan


Bodin Bruno wrote:
I found a part of problem.
it's a call to a IPBX
When there is an unavailability of number then I get this from IPBX :
503 Service Unavailable

That seem to work correctly. But when I recall a number to this IPBX (same or another number ), openser don't try to call IPBX and only send it to user :
473 Filtered destination (473/TM)

thank for your light



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