Change status code for "Host not found"
Hi, I'm running postfix as a relay connected via VPN. If the VPN is down mails are rejected: relay=none, delay=0.09, delays=0.06/0.02/0.01/0, dsn=5.4.4, status=bounced (Host or domain name not found. Name service error for name=EXCHANGE01 type=: Host not found) Is there a way to change the dsn to 4xx and deliver it when the VPN is up again? Thank you!
Re: Change status code for "Host not found"
Hi on 2019/9/12 22:01, Helmut Schneider wrote: relay=none, delay=0.09, delays=0.06/0.02/0.01/0, dsn=5.4.4, status=bounced (Host or domain name not found. Name service error for name=EXCHANGE01 type=: Host not found) This is a network issue rather than postfix problem I may think. You should fix up the network after VPN is down. regards.
Re: Change status code for "Host not found"
Helmut Schneider: [ Charset ISO-8859-1 converted... ] > Hi, > > I'm running postfix as a relay connected via VPN. If the VPN is down > mails are rejected: > > relay=none, delay=0.09, delays=0.06/0.02/0.01/0, dsn=5.4.4, > status=bounced (Host or domain name not found. Name service error for > name=EXCHANGE01 type=: Host not found) It's status=bounced (dsn=5.4.4) because Postfix received a DNS NXDOMAIN (name does not exist) response for the name 'EXCHANGE01'. > Is there a way to change the dsn to 4xx and deliver it when the VPN is > up again? http://www.postfix.org/postconf.5.html#default_delivery_status_filter Look under the examples for smtp_delivery_status_filter. Here is an untested variant that should work. /etc/postfix/main.cf: smtp_delivery_status_filter = pcre:/etc/postfix/smtp_dsn_filter /etc/postfix/smtp_dsn_filter: /^5(\.\d+\.\d+ Name service error for name=EXCHANGE01/ 4$1 You can't use http://www.postfix.org/postconf.5.html#smtp_dns_reply_filter because that feature requires that the server returns a reply, not NXDOMAIN. Wietse
Re: Change status code for "Host not found"
Wietse Venema: > Helmut Schneider: > [ Charset ISO-8859-1 converted... ] > > Hi, > > > > I'm running postfix as a relay connected via VPN. If the VPN is down > > mails are rejected: > > > > relay=none, delay=0.09, delays=0.06/0.02/0.01/0, dsn=5.4.4, > > status=bounced (Host or domain name not found. Name service error for > > name=EXCHANGE01 type=: Host not found) > > It's status=bounced (dsn=5.4.4) because Postfix received a DNS > NXDOMAIN (name does not exist) response for the name 'EXCHANGE01'. > > > Is there a way to change the dsn to 4xx and deliver it when the VPN is > > up again? > > http://www.postfix.org/postconf.5.html#default_delivery_status_filter > Look under the examples for smtp_delivery_status_filter. Here is > an untested variant that should work. > > /etc/postfix/main.cf: >smtp_delivery_status_filter = pcre:/etc/postfix/smtp_dsn_filter > > /etc/postfix/smtp_dsn_filter: > /^5(\.\d+\.\d+ Name service error for name=EXCHANGE01/ 4$1 Should be: /^5(\.\d+\.\d+ Name service error for name=EXCHANGE01)/ 4$1 (i.e. there was no closing ')'). Wietse > You can't use http://www.postfix.org/postconf.5.html#smtp_dns_reply_filter > because that feature requires that the server returns a reply, not > NXDOMAIN. > > Wietse >
Re: Change status code for "Host not found"
Wietse Venema wrote: > Helmut Schneider: > [ Charset ISO-8859-1 converted... ] > > Hi, > > > > I'm running postfix as a relay connected via VPN. If the VPN is down > > mails are rejected: > > > > relay=none, delay=0.09, delays=0.06/0.02/0.01/0, dsn=5.4.4, > > status=bounced (Host or domain name not found. Name service error > > for name=EXCHANGE01 type=: Host not found) > > It's status=bounced (dsn=5.4.4) because Postfix received a DNS > NXDOMAIN (name does not exist) response for the name 'EXCHANGE01'. > > > Is there a way to change the dsn to 4xx and deliver it when the VPN > > is up again? > > http://www.postfix.org/postconf.5.html#default_delivery_status_filter > Look under the examples for smtp_delivery_status_filter. Here is > an untested variant that should work. > > /etc/postfix/main.cf: >smtp_delivery_status_filter = pcre:/etc/postfix/smtp_dsn_filter > > /etc/postfix/smtp_dsn_filter: > /^5(\.\d+\.\d+ Name service error for name=EXCHANGE01/ 4$1 Works like a charm, thank you!
