Dear,
I setup my postfix with transport per domain according with ISP recommandation. Some ISP recommend to send email : For exemple Yahoo accepts 20 @ per SMTP connection and 20 concurrency connection. They also regultate the number of connection per hour. Hotmail recommendation is : 20 simultanous connection 100 messages send per open SMTP connection No more 1000 connection per hours. When I use the rate_delay the concurrency is forced to 1. In this case Postfix send email 1 by 1 to yahoo with rate delay. I try to use the smtp connection cache to send more email by connection but it not working. My question how can regulate the number of simultaneous connection per domain, the number of messages sending during open connection for specific domain and have rate delay between sending for specific domain? I already setup the transport, the main.cf and master.cf Thank for your reply Mick
