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[gregl]

We are noticing higher than normal soft bounces on 3 of the Yahoo MX servers:
b.mx.mail.yahoo.com
i.mx.mail.yahoo.com
l.mx.mail.yahoo.com

Below are the soft bounce counts taken from our acct-t logs today.  The 3 mx servers in question are in the 74.6.0.0/16 range.
 9639 l.mx.mail.yahoo.com (74.6.136.244)
   4080 i.mx.mail.yahoo.com (74.6.140.64)
   2132 b.mx.mail.yahoo.com (74.6.136.65)
    229 f.mx.mail.yahoo.com (98.137.54.237)
    190 g.mx.mail.yahoo.com (98.137.54.238)
    113 m.mx.mail.yahoo.com (66.94.238.147)
     80 j.mx.mail.yahoo.com (66.94.237.64)
     78 h.mx.mail.yahoo.com (66.94.236.34)
     52 k.mx.mail.yahoo.com (98.139.54.60)
     40 o.mx.mail.yahoo.com (66.94.237.139)
     39 n.mx.mail.yahoo.com (98.139.175.224)
     33 d.mx.mail.yahoo.com (209.191.88.254)
     22 e.mx.mail.yahoo.com (67.195.168.230)
     16 c.mx.mail.yahoo.com (98.139.175.225)
      8 a.mx.mail.yahoo.com (67.195.168.31)

Would it be advisable to exclude the 3 MX servers by using the config below?
<domain yahoo.com>
route a.mx.mail.yahoo.com,c.mx.mail.yahoo.com,d.mx.mail.yahoo.com,e.mx.mail.yahoo.com,f.mx.mail.yahoo.com,g.mx.mail.yahoo.com,h.mx.mail.yahoo.com,j.mx.mail.yahoo.com,k.mx.mail.yahoo.com,m.mx.mail.yahoo.com,n.mx.mail.yahoo.com,o.mx.mail.yahoo.com
</domain>

Thank you.

[Port25-Admin1]

It's worth a try.  Let us know if it works, as this would be a nice little trick.

[gregl]

Anybody else out there experiencing high soft bounces on b.mx.mail.yahoo.com, i.mx.mail.yahoo.com, and l.mx.mail.yahoo.com?

I've added the route directive and I'm now seeing fewer soft bounces since pmta is avoiding the 3 mx servers above.

[archie]

How did you get those statistics? I couldn't do it using pmtastats.

BTW, are you now seeing less soft bounces from yahoo?

[gregl]

Used the following command to get the stats:
grep domain.com acct-t-2011-09-19-00* | grep mx.mail.yahoo.com |cut -f11 -d ',' |sort |uniq -c |sort -rg

When we implemented the route directive to exclude the soft bouncing 74.6.X.X yahoo mx servers, our soft bounces dropped significantly.

Noticed today yahoo updated their mx servers to
yahoo.com.      182   IN   MX   1 mta6.am0.yahoodns.net.
yahoo.com.      182   IN   MX   1 mta7.am0.yahoodns.net.
yahoo.com.      182   IN   MX   1 mta5.am0.yahoodns.net.

Because of the update, had to disable using the route directive.

[Port25-Admin1]

Greg,
Just to let you know I started this thread based on your command:
http://www.port25.com/forum/index.php?topic=1205.0