Hi,
I was hoping for real MX record round-robin but it does not work on one of my servers. Somehow, postfix is prioritising one of the MX more than others. Always the same: nlp3.loc-prd.net All MX servers, are in local network to this client mailserver. We have relayhost in main.cf: relayhost = mxmail.adatum.net We have MX record for this relayhost with equal weights of 10 for each, DNS TTL is setup to 300s, dns system is BIND, not Windows. dig mx mxmail.adatum.net mxmail.adatum.net. 146 IN MX 10 nlp1.loc-prd.net. mxmail.adatum.net. 146 IN MX 10 nlp2.loc-prd.net. mxmail.adatum.net. 146 IN MX 10 nlp3.loc-prd.net. mxmail.adatum.net. 146 IN MX 10 nlp6.loc-prd.net. mxmail.adatum.net. 146 IN MX 10 nlp5.loc-prd.net. mxmail.adatum.net. 146 IN MX 10 nlp4.loc-prd.net. Some setup parametres for better view: smtp_randomize_addresses = yes smtp_mx_address_limit = 10 smtp_mx_session_limit = 2 smtp_connection_cache_on_demand = yes smtp_connection_cache_time_limit = 2s default_destination_concurrency_limit = 20 smtp_destination_concurrency_limit = $default_destination_concurrency_limit default_destination_concurrency_failed_cohort_limit = 1 We have another 2 servers with the same setup, and they relay quite equally. Anything that will help to sove this issue would be much appreciated. Best regards, John
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