On Tue, Apr 22, 2014 at 01:50:49PM -0400, Wietse Venema wrote:
> A global limit on the number of pending probes affects only unknown
> email addresses. Postfix proactively refreshes known email addresses
> well before they expire. I am not an idiot.
Whether this is sufficient depends on the cache hit rate, and
proportion of addresses that receive infrequent mail. Postfix does
not send refresh probes unless the recipient is actually sent a
message, right? The OP may benefit from a longer positive cache
lifetime, and a separate transport for probes. Customers that
tarpit probes are not doing anyone a favour, perhaps cluestick can
be applied.
--
Viktor.
