Begini caranya:
host> echo "Hey my man" | mail -s "Testing" myaddress@gmail.com
Kemudian, di /var/log/mail.log:
Sep 13 12:08:31 host postfix/pickup[738]: EB0535EF3F3: uid=501 from=<user>
Sep 13 12:08:31 host postfix/cleanup[753]: EB0535EF3F3: message-id=<20100913190831.EB0535EF3F3@host.local>
Sep 13 12:08:31 host postfix/qmgr[739]: EB0535EF3F3: from=<user@host.local>, size=309, nrcpt=1 (queue active)
Sep 13 12:08:32 host postfix/smtp[755]: connect to gmail-smtp-in.l.google.com[72.14.213.27]:25: Host is down
Sep 13 12:08:32 host postfix/smtp[755]: connect to alt1.gmail-smtp-in.l.google.com[74.125.127.27]:25: Host is down
Sep 13 12:08:32 host postfix/smtp[755]: connect to alt2.gmail-smtp-in.l.google.com[74.125.67.27]:25: Host is down
Sep 13 12:08:32 host postfix/smtp[755]: connect to alt3.gmail-smtp-in.l.google.com[74.125.45.27]:25: Host is down
Sep 13 12:08:32 host postfix/smtp[755]: connect to alt4.gmail-smtp-in.l.google.com[209.85.227.27]:25: Host is down
Sep 13 12:08:32 host postfix/smtp[755]: EB0535EF3F3: to=<myaddress@gmail.com>, relay=none, delay=0.22, delays=0.02/0.01/0.19/0, dsn=4.4.1, status=deferred (connect to alt4.gmail-smtp-in.l.google.com[209.85.227.27]:25: Host is down)
Uh benarkah? Gmail sedang down? Tidak juga: berfungsi dari berbagai aplikasi email saya, dll. Menjalankan dig alt4.gmail-smtp-in.l.google.com
hasil:
; <<>> DiG 9.6.0-APPLE-P2 <<>> alt4.gmail-smtp-in.l.google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 57897
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 4
;; QUESTION SECTION:
;alt4.gmail-smtp-in.l.google.com. IN A
;; ANSWER SECTION:
alt4.gmail-smtp-in.l.google.com. 168 IN A 209.85.227.27
;; AUTHORITY SECTION:
google.com. 567 IN NS ns1.google.com.
google.com. 567 IN NS ns4.google.com.
google.com. 567 IN NS ns3.google.com.
google.com. 567 IN NS ns2.google.com.
;; ADDITIONAL SECTION:
ns1.google.com. 768 IN A 216.239.32.10
ns2.google.com. 657 IN A 216.239.34.10
ns3.google.com. 867 IN A 216.239.36.10
ns4.google.com. 598 IN A 216.239.38.10
;; Query time: 14 msec
;; SERVER: 192.168.1.1#53(192.168.1.1)
;; WHEN: Mon Sep 13 12:08:43 2010
;; MSG SIZE rcvd: 201
Terlihat bagus untukku. Saya mencoba akun Google Apps saya dan menerima:
Sep 13 12:26:16 host postfix/smtp[1160]: connect to ASPMX.L.GOOGLE.COM[74.125.127.27]:25: Host is down
Sep 13 12:26:16 host postfix/smtp[1160]: BB2655EF5D7: to=<user@domain.com>, relay=none, delay=5.1, delays=0.01/0.01/5.1/0, dsn=4.4.1, status=deferred (connect to ASPMX.L.GOOGLE.COM[74.125.127.27]:25: Host is down)
Tapi tentu saja tidak down. Ini adalah instalasi Snow Leopard - belum main-main dengan file konfigurasi postfix atau apa pun. Saya perlu surat untuk bekerja untuk surat terkait pekerjaan cron dan ini membuat saya gila.
Ada ide? Ada juga sedikit bukti yang memberatkan ini:
host> telnet aspmx.l.google.com 25
Trying 74.125.67.27...
telnet: connect to address 74.125.67.27: Host is down
telnet: Unable to connect to remote host
Apakah ada sesuatu yang disaring di tingkat ISP saya, atau apa?