I had a customer complain they had not received emails that someone had sent them and perusing maillog I found lines like these: ---snip--- Jul 20 14:03:53 ns9 postfix/smtpd[2850]: NOQUEUE: reject: RCPT from unknown[216.107.155.81]: 450 4.2.0 <[email protected]>: Recipient address rejected: Greylisted, see http://postgrey.schweikert.ch/help/mandalaresearch.com.html; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<plinraw.info> Jul 20 14:03:53 ns9 postfix/smtpd[2850]: lost connection after RCPT from unknown[216.107.155.81] Jul 20 14:03:53 ns9 postfix/smtpd[2850]: disconnect from unknown[216.107.155.81] Jul 20 14:03:58 ns9 postfix/smtpd[2850]: connect from mail-bn1on0141.outbound.protection.outlook.com[157.56.110.141] Jul 20 14:03:58 ns9 postfix/smtpd[3520]: warning: database /etc/mailman/virtual-mailman.db is older than source file /etc/mailman/virtual-mailman Jul 20 14:03:58 ns9 postfix/smtpd[3520]: connect from mx4.mycheapoair.com[64.61.65.99] Jul 20 14:03:59 ns9 postgrey[2428]: action=greylist, reason=new, client_name=mail-bn1on0141.outbound.protection.outlook.com, client_address=157.56.110.141, sender=[email protected], recipient=[email protected] Jul 20 14:03:59 ns9 postfix/smtpd[2850]: NOQUEUE: reject: RCPT from mail-bn1on0141.outbound.protection.outlook.com[157.56.110.141]: 450 4.2.0 <[email protected]>: Recipient address rejected: Greylisted, see http://postgrey.schweikert.ch/help/greenhomeandoffice.net.html; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<na01-bn1-obe.outbound.protection.outlook.com> Jul 20 14:03:59 ns9 postfix/smtpd[2850]: warning: network_biopair_interop: error writing 69 bytes to the network: Connection reset by peer Jul 20 14:03:59 ns9 postfix/smtpd[2850]: warning: network_biopair_interop: error writing 69 bytes to the network: Broken pipe Jul 20 14:03:59 ns9 postfix/smtpd[2850]: disconnect from mail-bn1on0141.outbound.protection.outlook.com[157.56.110.141] Jul 20 14:04:00 ns9 postgrey[2428]: action=pass, reason=triplet found, client_name=mx4.mycheapoair.com, client_address=64.61.65.99, sender=[email protected], recipient=[email protected] Jul 2 ----snip--- who is being greylisted? my server? or the other end? and any idea what the network_biopair-interop error means? associated with one of the messages... thanks cdb.
The message: Jul 20 14:04:00 ns9 postgrey[2428]: action=pass, reason=triplet found, client_name=mx4.mycheapoair.com, client_address=64.61.65.99, sender=[email protected], recipient=[email protected] Jul 2 means that your server accepted and delivered the message to the account [email protected] after the greylisting period was over.
