Hello esteemed colleagues, I'm looking at an issue receiving messages from one particular site. Exim is refusing to accept the message, after the incoming connection fails a reverse lookup test. The site claims they sometimes get this problem sending to other sites, but ours is most prevalent.
As far as I can see from debugging, the resolver is behaving strangely, but I do not understand why, and I know there are cleverer minds here. OS is FreeBSD 7.2 on these hosts, in case that's relevant. Here's some of the exim debugging output when I fake a session with exim -bh: DNS lookup of 5.131.80.194.in-addr.arpa (PTR) succeeded IP address lookup yielded uwrz46.wales.ac.uk alias ezproxy.wales.ac.uk alias ezproxy2.wales.ac.uk alias *.test.wales.ac.uk alias *.ezproxy.wales.ac.uk alias *.ezproxy2.wales.ac.uk alias test.wales.ac.uk alias cymru.ac.uk alias wales.ac.uk alias uwrz05.cymru.ac.uk alias uwrz15.wales.ac.uk alias uwrz46.cymru.ac.uk gethostbyname2(af=inet6) returned 4 (NO_DATA) gethostbyname2 looked up these IP addresses: name=uwrz46.wales.ac.uk address=194.80.131.5 checking addresses for uwrz46.wales.ac.uk 194.80.131.5 OK gethostbyname2(af=inet6) returned 4 (NO_DATA) gethostbyname2 looked up these IP addresses: name=ezproxy.wales.ac.uk address=194.80.131.5 checking addresses for ezproxy.wales.ac.uk 194.80.131.5 OK gethostbyname2(af=inet6) returned 4 (NO_DATA) gethostbyname2 looked up these IP addresses: name=ezproxy2.wales.ac.uk address=194.80.131.5 checking addresses for ezproxy2.wales.ac.uk 194.80.131.5 OK gethostbyname2(af=inet6) returned 4 (NO_DATA) gethostbyname2(af=inet) returned 3 (NO_RECOVERY) no IP address found for host *.test.wales.ac.uk (during SMTP connection from [194.80.131.5]) *.test.wales.ac.uk in dns_again_means_nonexist? no (option unset) temporary error for host name lookup Cranking debugging a bit higher: ;; res_nquerydomain(*.test.wales.ac.uk, <Nil>, 1, 1) ;; res_query(*.test.wales.ac.uk, 1, 1) ;; res_nmkquery(QUERY, *.test.wales.ac.uk, IN, A) ;; res_send() ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 53692 ;; flags: rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 ;; *.test.wales.ac.uk, type = A, class = IN ;; Querying server (# 1) address = 127.0.0.1 ;; new DG socket ;; got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 53692 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2 ;; *.test.wales.ac.uk, type = A, class = IN *.test.wales.ac.uk. 41m45s IN A 194.80.131.5 wales.ac.uk. 14h54m59s IN NS uwrz02.wales.ac.uk. wales.ac.uk. 14h54m59s IN NS uwrz04.wales.ac.uk. uwrz02.wales.ac.uk. 41m45s IN A 194.80.131.2 uwrz04.wales.ac.uk. 41m45s IN A 194.80.131.6 10:39:58 23259 gethostbyname2(af=inet) returned 3 (NO_RECOVERY) So an answer is returned, but for some reason the name lookup library function returns NO_RECOVERY, which exim then interprets as a failure. Can anyone explain this behaviour? Ta, Jethro. . . . . . . . . . . . . . . . . . . . . . . . . . Jethro R Binks, Network Manager, Information Services Directorate, University Of Strathclyde, Glasgow, UK The University of Strathclyde is a charitable body, registered in Scotland, number SC015263. -- ## List details at http://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
