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Thursday, February 18, 2016

cara Merubah port SMTP di Postfix

Umumnya beberapa ISP menutup port akses SMTP atau port 25 bagi pelanggannya. Hal ini tentu menyulitkan para sysadmin mail server , walaupun masih bisa diatasi dengan menggunakan SMTP yang disediakan provider. Menurut saya rasanya kurang afdhall kalau memang masih ada cara lain heheh .. yaudah langsung aja cara merubah port SMTP di postfix.


nano /etc/postfix/master.cf

sebelumnya
smtp      inet  n       -       -       -       -       smtpd

sesudah
1988      inet  n       -       -       -       -       smtpd

lalu restart postfix 
service postfix restart

kemudian test dengan nmap localhost


  root@ns4:~# nmap localhost

Starting Nmap 5.00 ( http://nmap.org ) at 2016-02-18 16:30 WIB
Warning: Hostname localhost resolves to 2 IPs. Using 127.0.0.1.
Interesting ports on localhost (127.0.0.1):
Not shown: 996 closed ports
PORT     STATE SERVICE
53/tcp   open  domain
80/tcp   open  http
81/tcp   open  hosts2-ns
3306/tcp open  mysql

tar port 25 sudah tidak ada lagi 

Semoga bermanfaat

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