Konfigurasi Email Server Dengan SPF Dan DKIM Di Aplikasi Postfix Pada CentOS 7

Sun, 27 Mar 2016 12:59:09 +0700

Setelah kita melakukan instalasi email server, cek skor email server di website Mail Tester. Salah satu contoh hasil pengecekan website tersebut sebagai berikut.

Content:
[Text]
[HTML]
[Source]
SpamAssassin:
[Score]
The famous spam filter SpamAssassin. A score below -5 is considered spam.
Authentication:
We check if the server you are sending from is authenticated
[SPF]
Sender Policy Framework (SPF) is an email validation system designed to prevent email spam by detecting email spoofing, a common vulnerability, by verifying sender IP addresses.
[Sender ID]
Sender ID is like SPF, but it checks the FROM address, not the bounce address.
[DKIM]
DomainKeys Identified Mail (DKIM) is a method for associating a domain name to an email message, thereby allowing a person, role, or organization to claim some responsibility for the message.
[DMARC record]
A DMARC policy allows a sender to indicate that their emails are protected by SPF and/or DKIM, and give instruction if neither of those authentication methods passes. Please be sure you have a DKIM and SPF set before using DMARC.
[PTR record]
Reverse DNS lookup or reverse DNS resolution (rDNS) is the determination of a domain name that is associated with a given IP address. Some companies such as AOL will reject any message sent from a server without rDNS, so you must ensure that you have one. You cannot associate more than one domain name with a single IP address.
[A record]
We check if there is a mail server (A Record) behind your hostname.
Errors:
Checks whether your message is well formatted or not.
[Image alternate tag]
alt attributes provide a textual alternative to your images. It is a useful fallback for people suffering from sight problems and for cases where your images cannot be displayed.
[HTML elements]
Checks whether your message contains dangerous html elements such as javascript, iframes, embed content or applet.
[URL shortener]
Checks whether your message uses URL shortener systems.
[List-Unsubscribe header]
The List-Unsubscribe header is required if you send mass emails, it enables the user to easily unsubscribe from your mailing list.
[Blacklist]
Matches your server IP address against 22 of the most common ipv4 blacklists.

Untuk meningkatkan skor, kita bisa memperbaiki konfigurasi email server dengan SPF dan DKIM

Postfix on Pras' Labs

Konfigurasi Email Server Dengan SPF Dan DKIM Di Aplikasi Postfix Pada CentOS 7