Hello, My mail gateway Postfix acts as mail exchanger for the domain 'recipientdomain.it'. After receiving a message for the domain, it forwards emails to the postoffice server (MS Exchange 2010) with address xxx.yyy.www.zzz. The mail gateway is configured for recipient verification for domain 'recipientdomain.it':
# postmap -q x...@recipientdomain.it proxy:mysql:/etc/postfix/mysql-relay-recipients.cf reject_unverified_recipient But this feature does not work from time to time. Here two example. FIRST CASE (work): Aug 29 11:23:39 mailgw postfix/smtp[17651]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 220 DM-EXCHANGE2010.recipientdomain.local Microsoft ESMTP MAIL Service ready at Thu, 29 Aug 2013 11:24 Aug 29 11:23:39 mailgw postfix/smtp[17651]: > xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: EHLO mailgw.mydomain.tld Aug 29 11:23:39 mailgw postfix/smtp[17651]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-DM-EXCHANGE2010.recipientdomain.local Hello [80.74.176.117] Aug 29 11:23:39 mailgw postfix/smtp[17651]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-SIZE Aug 29 11:23:39 mailgw postfix/smtp[17651]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-PIPELINING Aug 29 11:23:39 mailgw postfix/smtp[17651]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-DSN Aug 29 11:23:39 mailgw postfix/smtp[17651]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-ENHANCEDSTATUSCODES Aug 29 11:23:39 mailgw postfix/smtp[17651]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-STARTTLS Aug 29 11:23:39 mailgw postfix/smtp[17651]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-X-ANONYMOUSTLS Aug 29 11:23:39 mailgw postfix/smtp[17651]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-AUTH NTLM Aug 29 11:23:39 mailgw postfix/smtp[17651]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-X-EXPS GSSAPI NTLM Aug 29 11:23:39 mailgw postfix/smtp[17651]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-8BITMIME Aug 29 11:23:39 mailgw postfix/smtp[17651]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-BINARYMIME Aug 29 11:23:39 mailgw postfix/smtp[17651]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-CHUNKING Aug 29 11:23:39 mailgw postfix/smtp[17651]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-XEXCH50 Aug 29 11:23:39 mailgw postfix/smtp[17651]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-XRDST Aug 29 11:23:39 mailgw postfix/smtp[17651]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250 XSHADOW Aug 29 11:23:39 mailgw postfix/smtp[17651]: > xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: MAIL FROM:<double-bou...@mailgw.mydomain.tld> SIZE=236 Aug 29 11:23:39 mailgw postfix/smtp[17651]: > xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: RCPT TO:<hannig...@recipientdomain.it> ORCPT=rfc822;hannig...@recipientdomain.it Aug 29 11:23:39 mailgw postfix/smtp[17651]: > xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: RSET Aug 29 11:23:39 mailgw postfix/smtp[17651]: > xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: QUIT Aug 29 11:23:39 mailgw postfix/smtp[17651]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250 2.1.0 Sender OK Aug 29 11:23:39 mailgw postfix/smtp[17651]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 550 5.1.1 User unknown Aug 29 11:23:39 mailgw postfix/smtp[17651]: send attr reason = host xxx.yyy.www.zzz[xxx.yyy.www.zzz] said: 550 5.1.1 User unknown (in reply to RCPT TO command) Aug 29 11:23:39 mailgw postfix/smtp[17651]: 663C1D5BC6: to=<hannig...@recipientdomain.it>, relay=xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25, delay=0.04, delays=0.01/0.01/0.02/0.01, dsn=5.1.1, status=undeliverable (host xxx.yyy.www.zzz[xxx.yyy.www.zzz] said: 550 5.1.1 User unknown (in reply to RCPT TO command)) Aug 29 11:23:39 mailgw postfix/smtp[17651]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 221 2.0.0 Service closing transmission channel SECOND CASE (NOT WORK): Aug 29 11:23:56 mailgw postfix/smtp[17683]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 220 DM-EXCHANGE2010.recipientdomain.local Microsoft ESMTP MAIL Service ready at Thu, 29 Aug 2013 11:25 Aug 29 11:23:56 mailgw postfix/smtp[17683]: > xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: EHLO mailgw.mydomain.tld Aug 29 11:23:56 mailgw postfix/smtp[17683]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-DM-EXCHANGE2010.recipientdomain.local Hello [80.74.176.117] Aug 29 11:23:56 mailgw postfix/smtp[17683]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-SIZE Aug 29 11:23:56 mailgw postfix/smtp[17683]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-PIPELINING Aug 29 11:23:56 mailgw postfix/smtp[17683]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-DSN Aug 29 11:23:56 mailgw postfix/smtp[17683]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-ENHANCEDSTATUSCODES Aug 29 11:23:56 mailgw postfix/smtp[17683]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-STARTTLS Aug 29 11:23:56 mailgw postfix/smtp[17683]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-X-ANONYMOUSTLS Aug 29 11:23:56 mailgw postfix/smtp[17683]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-AUTH NTLM Aug 29 11:23:56 mailgw postfix/smtp[17683]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-X-EXPS GSSAPI NTLM Aug 29 11:23:56 mailgw postfix/smtp[17683]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-8BITMIME Aug 29 11:23:56 mailgw postfix/smtp[17683]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-BINARYMIME Aug 29 11:23:56 mailgw postfix/smtp[17683]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-CHUNKING Aug 29 11:23:56 mailgw postfix/smtp[17683]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-XEXCH50 Aug 29 11:23:56 mailgw postfix/smtp[17683]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250-XRDST Aug 29 11:23:56 mailgw postfix/smtp[17683]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 250 XSHADOW Aug 29 11:23:56 mailgw postfix/smtp[17683]: > xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: MAIL FROM:<double-bou...@mailgw.mydomain.tld> SIZE=236 Aug 29 11:23:56 mailgw postfix/smtp[17683]: > xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: RCPT TO:<davide.dac...@recipientdomain.it> ORCPT=rfc822;davide.dac...@recipientdomain.it Aug 29 11:23:56 mailgw postfix/smtp[17683]: > xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: RSET Aug 29 11:23:56 mailgw postfix/smtp[17683]: > xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: QUIT Aug 29 11:23:56 mailgw postfix/smtp[17683]: < xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25: 221 2.0.0 Service closing transmission channel Aug 29 11:23:56 mailgw postfix/smtp[17683]: send attr reason = lost connection with xxx.yyy.www.zzz[xxx.yyy.www.zzz] while sending RCPT TO Aug 29 11:23:56 mailgw postfix/smtp[17683]: 6FF3AD5C79: to=<davide.dac...@recipientdomain.it>, relay=xxx.yyy.www.zzz[xxx.yyy.www.zzz]:25, delay=0.03, delays=0.01/0.01/0.01/0.01, dsn=4.4.2, status=undeliverable (lost connection with xxx.yyy.www.zzz[xxx.yyy.www.zzz] while sending RCPT TO) It seems that in the latter case Exchange fails to respond to the SMTP commands MAIL and RCPT. Could someone tell why this happens? How can I solve this? What have to be done eventually on the downstream server side? Regards, rocsca
