I can reproduce this issue too but I doubt that falling back on DNS lookups on UDP only is a good solution. According to this reference http://www.ietf.org/proceedings/42/I-D/draft-ietf-dnsind-udp-size-02.txt the maximum size of a DNS packet in UDP is 512 : The Domain Name System defaults to using UDP for queries and replies with a DNS payload limit of 512 bytes. Larger replies cause an initial truncation indication leading to a subsequent handling via TCP with substantially higher overhead.
A lot of DKIM TXT record would not fit in such small packets. -- dkim-filter fails to work if it cannot open a TCP connection to nameserver port DNS https://bugs.launchpad.net/bugs/387171 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
