Support for delivering recipient chunks via multiple threads. Python

must have been built with threading support, and MAX_DELIVERY_THREADS
must be > 0.  It is not enabled by default because it's not clear this
is a performance win.  This feature should be considered experimental
for now.

Specifically,

process(), deliver(): No longer needs the MailList object in it's
argument list.  This allows us to multi-thread actual message
delivery.  We also calculate the message's text and the admin address
only once.  deliver() also takes a dictionary for failures, which it
updates with chunk failures.

Convert logging stuff to use new syslog() interface instead of
MailList.LogMsg().

Log total delivery time instead of chunk delivery time.

chunkify(): Instead of a separate bucket for each TLD, we now have
only 4 buckets for recipients:

 .com
 .net/.org
 .edu/.ca/.us
 everything else

buckets are not backfilled.

pre_deliver(), threaded_deliver(): New functions.

0 files changed, 0 insertions, 0 deletions