@gen2brain: Ako stavis nesta u zagradice, onda je to ovako:
Ako stavis ip address, onda tako i tako nece da pravi DNS lookup.
Ako stavis host name (kazemo "test.domain.tld") u zagradice, onda Postfix nece da pravi DNS lookup za MX record ali ce ipak praviti lookup da pronadje ip adresu. Jeli to razumes?
Kazemo ovo ovde (email za test@gentoo-srbija.org), onda moze:
1) test@gentoo-srbija.org smtp:[195.129.121.147]
-> Mail ide automaticno na ip address 195.129.121.147
2) test@gentoo-srbija.org smtp:gentoo-srbija.org
-> Mail ide na MX record od DNS (sto je isto 195.129.121.147):
steveb@thinkpad ~ $ dig in mx gentoo-srbija.org
; <<>> DiG 9.3.2 <<>> in mx gentoo-srbija.org
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 64268
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
;; QUESTION SECTION:
;gentoo-srbija.org. IN MX
;; ANSWER SECTION:
gentoo-srbija.org. 10800 IN MX 10 mail.gentoo-srbija.org.
gentoo-srbija.org. 10800 IN MX 20 mail.visionunit.net.
;; ADDITIONAL SECTION:
mail.gentoo-srbija.org. 10800 IN A 195.129.121.147
;; Query time: 275 msec
;; SERVER: 192.168.0.254#53(192.168.0.254)
;; WHEN: Thu Apr 27 23:33:35 2006
;; MSG SIZE rcvd: 107
steveb@thinkpad ~ $
3) test@gentoo-srbija.org smtp:[mail.gentoo-srbija.org]
-> Mail ide na host mail.gentoo-srbija.org (sto je isto 195.129.121.147):
steveb@thinkpad ~ $ host mail.gentoo-srbija.org
mail.gentoo-srbija.org has address 195.129.121.147
steveb@thinkpad ~ $
U svakom slucaju, samo 2) i 3) pravi DNS lookup. 1) ne pravi ikakav DNS lookup, zato sto je to vec jedna IP address.
Pozdrav
Stevan