I didn't see the errors Wietse did, but when I ran your domain through the report at www.dnsstuff.com it noted this (among a few other minor things): transitioning domain of kpbsd.k12.ak.us does not designate 74.123.240.23 as permitted sender | softfail | 74.123.240.23
Need to update your SPF record... ...Kevin -- Kevin Miller Network/email Administrator, CBJ MIS Dept. 155 South Seward Street Juneau, Alaska 99801 Phone: (907) 586-0242, Fax: (907) 586-4588 Registered Linux User No: 307357 -----Original Message----- From: owner-postfix-us...@postfix.org [mailto:owner-postfix-us...@postfix.org] On Behalf Of Wietse Venema Sent: Tuesday, November 06, 2018 8:05 AM To: Simba Cc: postfix-users@postfix.org Subject: Re: Strange issue Simba: > Mail service is working except for delivery to a single host, which is > reporting a strange error: > > postfix/smtp[13722]: 629D7A7DF9: to=<test...@kpbsd.k12.ak.us>, > relay=none, delay=1099, delays=1097/0/1.5/0, dsn=4.4.3, status=deferred > (Host or domain name not found. Name service error for > name=mx4.kpbsd.k12.ak.us type=A: Host not found, try again) Some DNS server replied to the MX request, with a list of servers that include mx4.kpbsd.k12.ak.us. > root:# host kpbsd.k12.ak.us > kpbsd.k12.ak.us has address 74.123.240.28 > kpbsd.k12.ak.us mail is handled by 30 mx3.kpbsd.k12.ak.us. > kpbsd.k12.ak.us mail is handled by 20 mail-gw.kpbsd.k12.ak.us. > kpbsd.k12.ak.us mail is handled by 40 mx4.kpbsd.k12.ak.us. > kpbsd.k12.ak.us mail is handled by 10 mx1.kpbsd.k12.ak.us. Some DNS server replied to the MX request, with a list of servers that does not include mx4.kpbsd.k12.ak.us. > root:# host mx4.kpbsd.k12.ak.us > mx4.kpbsd.k12.ak.us has address 74.123.240.23 > > Any help is appreciated! $ host -t ns kpbsd.k12.ak.us kpbsd.k12.ak.us name server ns1.acsalaska.net. kpbsd.k12.ak.us name server xdns.kpbsd.k12.ak.us. kpbsd.k12.ak.us name server ns2.acsalaska.net. $ host -t mx kpbsd.k12.ak.us ns1.acsalaska.net. Using domain server: Name: ns1.acsalaska.net. Address: 204.17.139.1#53 Aliases: kpbsd.k12.ak.us mail is handled by 40 mx4.kpbsd.k12.ak.us. kpbsd.k12.ak.us mail is handled by 30 mx3.kpbsd.k12.ak.us. kpbsd.k12.ak.us mail is handled by 20 mail-gw.kpbsd.k12.ak.us. kpbsd.k12.ak.us mail is handled by 10 mx1.kpbsd.k12.ak.us. $ host -t mx kpbsd.k12.ak.us ns2.acsalaska.net. Using domain server: Name: ns2.acsalaska.net. Address: 209.112.128.1#53 Aliases: kpbsd.k12.ak.us mail is handled by 30 mx3.kpbsd.k12.ak.us. kpbsd.k12.ak.us mail is handled by 10 mx1.kpbsd.k12.ak.us. kpbsd.k12.ak.us mail is handled by 20 mail-gw.kpbsd.k12.ak.us. kpbsd.k12.ak.us mail is handled by 40 mx4.kpbsd.k12.ak.us. Wietse
