Bila anda sering mengirim email melalui smtp Google ada baiknya me-whitelist kan IP-IP dari Google Mail, biar jangan sampai muncul masalah di kemudian hari, seperti email tidak terkirim ke gmail
Message: fsockopen(): unable to connect to ssl://smtp.gmail.com:465 (Connection timed out)
atau
[cipera@jaranguda] telnet smtp.gmail.com 465 Trying 173.194.64.108... telnet: connect to address 173.194.64.108: Connection timed out Trying 173.194.64.109... telnet: connect to address 173.194.64.109: Connection timed out Trying 2607:f8b0:4003:c02::6c... telnet: connect to address 2607:f8b0:4003:c02::6c: Network is unreachable
Buka file /etc/csf/csf.allow tambahkan dibarisan paling bawah
216.239.32.0/19 # Google Mail Server 64.233.160.0/19 # Google Mail Server 66.249.80.0/20 # Google Mail Server 72.14.192.0/18 # Google Mail Server 209.85.128.0/17 # Google Mail Server 66.102.0.0/20 # Google Mail Server 74.125.0.0/16 # Google Mail Server 64.18.0.0/20 # Google Mail Server 207.126.144.0/20 # Google Mail Server 173.194.0.0/16 # Google Mail Server
lalu restart csf
service csf restart