DNS/EDNS/tinydnsについて、ここに記述してください。
$ dig +edns=0 -t txt longlonglonglonglonglonglonglong.longlonglonglonglonglonglonglong3.qmail.jp @127.0.0.1
; <<>> DiG 9.12.1 <<>> +edns=0 -t txt longlonglonglonglonglonglonglong.longlonglonglonglonglonglonglong3.qmail.jp @127.0.0.1 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 49902 ;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;longlonglonglonglonglonglonglong.longlonglonglonglonglonglonglong3.qmail.jp. INTXT ;; ANSWER SECTION: longlonglonglonglonglonglonglong.longlonglonglonglonglonglonglong3.qmail.jp. 60IN TXT "verylonglonglonglonglonglonglonglong0.longlonglonglonglonglonglonglong.qmail.jp" longlonglonglonglonglonglonglong.longlonglonglonglonglonglonglong3.qmail.jp. 60IN TXT "verylonglonglonglonglonglonglonglong4.longlonglonglonglonglonglonglong.qmail.jp" longlonglonglonglonglonglonglong.longlonglonglonglonglonglonglong3.qmail.jp. 60IN TXT "verylonglonglonglonglonglonglonglong4.longlonglonglonglonglonglonglong4.qmail.jp-3" longlonglonglonglonglonglonglong.longlonglonglonglonglonglonglong3.qmail.jp. 60IN TXT "verylonglonglonglonglonglonglonglong1.longlonglonglonglonglonglonglong.qmail.jp-2" longlonglonglonglonglonglonglong.longlonglonglonglonglonglonglong3.qmail.jp. 60IN TXT "verylonglonglonglonglonglonglonglong3.longlonglonglonglonglonglonglong3.qmail.jp-3" ;; Query time: 36 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Mon Jul 23 00:07:01 JST 2018 ;; MSG SIZE rcvd: 572