On Tue, Feb 26, 2013 at 02:08:34PM +0200, Radwa Hamed wrote: > there is an error in mail log file when sending mail to some > hotmail accounts > > ... relay=none, delay=0.65, delays=0.45/0.14/0/0.06, dsn=4.4.2, > status=deferred (delivery temporarily suspended: lost connection > with mx2.hotmail.com[65.55.37.104] while sending RCPT TO) > > I want to know what is the reason for this error and how to solve it
First, note that the words "delivery temporarily suspended" mean that this error is the result of previous errors that lead to the suspension of message delivery to the destination. The error message is taken from the last failed delivery that caused delivery to be suspended. Delivery is suspended when multiple consecutive message deliveries are aborted by connection problems (not just invalid/refused recipients). The number of messages is by default the concurrency limit for the destination. Some users set very low concurrency limits for destinations such as Yahoo or Hotmail, hoping that this will help avoid rate limits imposed by the provider. One consequence of such low limits is that delivery is far more likely to be suspended in the face of a small burst of errors. This is especially likely if you configure a "rate delay" for the destination, which effectively sets the concurrency limit to 1. You'll get better help if you post your "postconf -n" configuration settings as requested in "http://www.postfix.org/DEBUG_README.html#mail";. You should also look further back in your log and find the actual deliveries that trigger the problem (the ones that don't have "delivery temporarily suspended" in the error reason). You'll see how many consecutive failures of this sort it took to throttle (suspend) delivery to Hotmail. -- Viktor.
