Re: postfix smtp relay - prodleva 8 sekund

To bys ale mel hledat dal, nechces predpokladam opisovat
cely ipv4 (natoz ipv6) rozsah do hosts. To vypada, ze ti to
dns nejak vubec nefunguje. Kompletni dotaz rozhodne netrva
8s ani kdyz v cache neni vubec nic. Takze to vypada, ze to
tipne prave postfix a to proto, ze mu to dns vubec neodpovi.

Hele (predevsim ten query time):

dig -x 45.143.222.191

; <<>> DiG 9.14.8 <<>> -x 45.143.222.191 ;; global options:
+cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status:
NXDOMAIN, id: 46888 ;; flags: qr rd ra ad; QUERY: 1, ANSWER:
0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096
; COOKIE: 011f34c969658694090c5d415e150b0ca5320f2c75f5d981
(good) ;; QUESTION SECTION: ;191.222.143.45.in-addr.arpa. IN
PTR

;; AUTHORITY SECTION: 45.in-addr.arpa. 10800 IN SOA
z.arin.net. dns-ops.arin.net. 2017028592 1800 900 691200
10800

;; Query time: 433 msec ;; SERVER: ::1#53(::1) ;; WHEN: Tue
Jan 07 23:49:48 CET 2020 ;; MSG SIZE rcvd: 153

Podruhy to nema smysl poustet, je to pod 1ms.

BTW: presne takovyhle maily se rovnou odpojujou, nema
reverz, neumi si zaridit za 10 minut nastaveni nebo ... nema
IP pod kontrolou => nema narok provozovat mta.

Zobrazit: http://www.abclinuxu.cz/poradna/linux/show/452106#8