In master.cf
smtp-tar unix  -        -       y       -       1       smtp
        -o syslog_name=postfix/$service_name

In main.cf
smtp-tar_destination_rate_delay = 600s
smtp-tar_destination_concurrency_limit = 3
smtp-tar_destination_recipient_limit = 2
smtp-tar_initial_destination_concurrency=2

In transports
yahoo.com       smtp-tar:

My understanding is that w/ the above settings, the first sends going to 
@yahoo.com should fire off two simultaneous smtp connections. Then at some 
point, it'll build up to three. I don't see that.

I reload postfix at 21:48 and this is what I see in the logs for outbound 
yahoo.com

Jan 17 21:48:01 postfix2 postfix/smtp-tar/smtp[2541820]: B142044CB2: 
to=<xx...@yahoo.com>, relay=mta5.am0.yahoodns.net[98.136.96.74]:25, delay=4255, 
delays=4255/0.06/0.15/0.4, dsn=2.0.0, status=sent (250 ok dirdel)
Jan 17 21:58:06 postfix2 postfix/smtp-tar/smtp[2542451]: EC44B44751: 
to=<yyy...@yahoo.com>, relay=mta6.am0.yahoodns.net[67.195.204.79]:25, 
delay=17699, delays=17093/601/0.23/5.1, dsn=2.0.0, status=sent (250 ok dirdel)
Jan 17 22:08:07 postfix2 postfix/smtp-tar/smtp[2543075]: 1135144D94: 
to=<zzz...@yahoo.com>, relay=mta6.am0.yahoodns.net[98.136.96.91]:25, 
delay=2122, delays=914/1206/0.16/0.67, dsn=2.0.0, status=sent (250 ok dirdel)

I'm only seeing one outbound at a time, every ten minutes.

Am I doing something wrong here?

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