I'm having a problem sending newsletters to certain domains/servers, like yahoo or minor network providers. It's like I'm spamming their servers with connections and they tell me to stop after a short while. I do get a bunch of emails through, but then I'm faced with messages like the below for a period of time (an hour or so) until the connection is reopened:
status=deferred (delivery temporarily suspended: lost connection with mx-eu.mail.am0.yahoodns.net[22.214.171.124]
I'm not interested in spamming their servers with connections and have tried various of different parameters in order to tune postfix to my needs. What I've tried so far in short:
- Reducing concurrent connections globally
- Inserting a delay of 1 second globally
- Reduced the number of processes to as low as 2
- Created specific policies for the domains in question (source: http://steam.io/2013/04/01/postfix-rate-limiting)
Does any of you have experience in this matter? And would it be possible to create policies for these specific recipient servers for instance yahoo?
Configuration examples will be appreciated.