On Tue, Sep 11, 2012 at 04:26:07PM +0530, DN Singh wrote: > domain3_destination_rate_delay = 30s > domain3_destination_recipient_limit = 1
This combination is unlikely to yield the results you expect. When a transport's recipient limit is set to 1, its concurrency is measured *per-mailbox*, not per *nexthop*. In this case you get at most one delivery per destination mailbox per 30 seconds, but concurrency accross multiple recipient email addresses is bounded only by the transport process limit. Best to leave the recipient limit at the default 50. -- Viktor.