On 3/7/2013 10:40 AM, Rishi wrote: > Hello > > I've been receiving lots of errors in mail.log > > Mar 7 11:49:47 mail postfix/smtpd[92520]: warning: > network_biopair_interop: error writing 37 bytes to the network: > Broken pipe > Mar 7 11:50:13 mail postfix/smtpd[92555]: warning: > network_biopair_interop: error writing 27 bytes to the network: > Broken pipe > Mar 7 11:50:56 mail postfix/smtpd[94257]: warning: > network_biopair_interop: error writing 37 bytes to the network: > Broken pipe > Mar 7 11:51:13 mail postfix/smtpd[92520]: warning: > network_biopair_interop: error writing 27 bytes to the network: > Broken pipe > Mar 7 11:51:57 mail postfix/smtpd[92615]: warning: > network_biopair_interop: error writing 37 bytes to the network: > Broken pipe > Mar 7 11:52:24 mail postfix/smtpd[92555]: warning: > network_biopair_interop: error writing 27 bytes to the network: > Broken pipe > Mar 7 11:52:31 mail postfix/smtpd[92555]: warning: > network_biopair_interop: error writing 37 bytes to the network: > Broken pipe > Mar 7 11:52:32 mail postfix/smtpd[92629]: warning: > network_biopair_interop: error writing 37 bytes to the network: > Broken pipe > Mar 7 11:53:08 mail postfix/smtpd[94255]: warning: > network_biopair_interop: error writing 27 bytes to the network: > Broken pipe > > > Any idea what this means?
This happens when a client sending you mail establishes a TLS connection, and then drops the connection before postfix can respond. > > The customer has been reporting delayed delivery of email. The above error > > Any tips on what I should look out for in the configuration? First examine your logs to see which clients this message is associated with by searching for the proceeding message from the same smtpd process. Sometimes spam bots will give this message; those can be ignored. If it's from just one or two non-spam clients, they may have a broken TLS implementation. You can disable TLS for specific clients with smtpd_discard_ehlo_keyword_address_maps. http://www.postfix.org/postconf.5.html#smtpd_discard_ehlo_keyword_address_maps -- Noel Jones
