Hi There, We receive over 500 log entries per day from Comcast that look like this:
Sep 18 03:05:07 mail0 r105/smtp[15929]: AE3378857BA: to=<some...@comcast.net>, relay=mx1.comcast.net[96.114.157.80]:25, delay=0.69, delays=0/0.01/0.6/0.08, dsn=4.1.0, status=deferred (host mx1.comcast.net[96.114.157.80] said: 421 4.1.0 75.126.209.105 Throttled - try again later. Please see http://postmaster.comcast.net/smtp-error-codes.php#RL000001 (in reply to MAIL FROM command)) The postmaster url says (among other things): If the rate-limit is impacting your ability to deliver email, shortening your server's delivery retry interval may resolve the issue. We decreased the delivery retry interval. queue_run_delay = 3m minimal_backoff_time = 3m maximal_backoff_time = 30m We have also decreased the arrival rate of outbound email to Postfix for all of the email we send. We hoped that the number of deferrals would reduce over time -- but this has not been the case. This deferred / retry seems to take a good deal of resources from both Comcast and the sender of email. Is there anything we can do to reduce the impact? Thanks, Greg
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