On Mon, Apr 18, 2016 at 12:15:13PM +0200, Thomas kinghorn wrote:
> In master.cf
>
> transport_maps = hash:/etc/postfix/vox_transport
> vox_destination_concurrency_limit = 20
> vox_destination_rate_delay = 2s
Setting a rate delay reduces the concurrency to 1.
> vox_destination_recipient_limit = 6
Setting a low recipient limit causes multi-recipient mesages to
split into more parts and consume more connections.
So if the destination accepts more than 6 recipients at a time,
use a larger limit.
The best way to resolve your issue is to get whitelisted by the
receiving system.
You may be able to reduce the impact of downstream connection limits
by slowing down positive and negative feedback:
smtp_destination_initial_concurrency = 2
smtp_destination_concurrency_positive_feedback = 0.2 / concurrency
smtp_destination_concurrency_negative_feedback = 0.5 / concurrency
This will grow the concurrency for each destination more slowly
and and will avoid throttling too quickly.
--
Viktor.
