Hi. I have two courier servers with the following topology:
internet <---> server1 <--vpn--> server2
Recently the vpn connection has been brought down for a couple of days and
as a result some thousands of mails for server2 have been queued up on
server1.
The vpn connection is now up and running but the rate of delivery of old
messages from server1 to server2 is painfully slow and as a result new
messages are getting queued as well. I have tried every possible
configuration to try to make things speed up but to no avail. I have raised
MAXPERIP, tinkered with queuelo and queuehi, disabled dns checks, disabled
idend lookups, check for backscatter blacklists etc etc. Nothing seems to
work. Every time I restart server1, or do a courier flush, it will deliver a
few messages (around 10 or so) and then it will slow down and deliver a
message ever 30 seconds or so.
Doing a ps or netstat will reveal courieresmtp processes connected but
sitting there and doing nothing (as evidenced by tethereal on the vpn
interface). And it is not as if the vpn has not enough bandwidh. In any case
most of the messages are spam to nonexistent users on server2 that get
rejected and therefore waste no bandwidth.
So can anyone suggest what it is I must look into to speed up the rate of
delivery ?
Thanks for your time and help.
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