Specify html id tags.
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__IMPORTANT NOTE__: `A`, `MX` records are required, `Reverse PTR`, `SPF`,
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`DKIM` and `DMARC` are optional but __STRONGLY__ recommended.
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## `A` record for server hostname
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## `A` record for server hostname {: id="a" }
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### What is an `A` record
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@ -53,7 +53,7 @@ mail.mydomain.com. 1800 A 192.168.1.5
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The end result of this record is that `www.mydomain.com` points to
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`192.168.1.2`, and `mail.mydomain.com` points to `192.168.1.5`.
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## Reverse PTR record for server IP address
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## Reverse PTR record for server IP address {: id="ptr" }
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### What is a reverse PTR record
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@ -83,7 +83,7 @@ PTR record `192.168.1.5` (your internet public IP address) in their reverse DNS
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zone. Reverse DNS zones are handled by your ISP even though you may have your
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own forward lookup DNS zone that you manage.
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## MX record for mail domain name
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## MX record for mail domain name {: id="mx" }
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### What is a MX record
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@ -119,7 +119,7 @@ mydomain.com. 10 mx mail.mydomain.com
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The end result of this record is, emails sent to `[user]@mydomain.com` will
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be delivered to server `mail.mydomain.com`.
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## SPF record for the mail domain name
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## SPF record for the mail domain name {: id="spf" }
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### What is a SPF record
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@ -164,7 +164,7 @@ mydomain.com. 3600 IN TXT "v=spf1 ip4:192.168.1.100 -all"
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There're more valid mechanisms available, please check
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[OpenSPF web site](http://www.openspf.org/SPF_Record_Syntax) for more details.
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## DKIM record for the mail domain name
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## DKIM record for the mail domain name {: id="dkim" }
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### What is a DKIM record
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@ -265,7 +265,7 @@ If you want to re-generate DKIM key, or need to generate one for new mail
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domain, please check our another tutorial:
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[Sign DKIM signature on outgoing emails for new mail domain](./sign.dkim.signature.for.new.domain.html).
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## DMARC record for the mail domain name
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## DMARC record for the mail domain name {: id="dmarc" }
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### What is DMARC, and how does it combat phishing?
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@ -19,33 +19,33 @@
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<div class="toc">
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<ul>
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<li><a href="#setup-dns-records-for-your-iredmail-server-a-ptr-mx-spf-dkim-dmarc">Setup DNS records for your iRedMail server (A, PTR, MX, SPF, DKIM, DMARC)</a><ul>
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<li><a href="#a-record-for-server-hostname">A record for server hostname</a><ul>
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<li><a href="#a">A record for server hostname</a><ul>
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<li><a href="#what-is-an-a-record">What is an A record</a></li>
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<li><a href="#how-to-setup-an-a-record">How to setup an A Record</a></li>
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</ul>
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</li>
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<li><a href="#reverse-ptr-record-for-server-ip-address">Reverse PTR record for server IP address</a><ul>
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<li><a href="#ptr">Reverse PTR record for server IP address</a><ul>
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<li><a href="#what-is-a-reverse-ptr-record">What is a reverse PTR record</a></li>
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<li><a href="#why-do-you-need-a-reverse-ptr-record">Why do you need a reverse PTR record</a></li>
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<li><a href="#how-to-setup-a-reverse-ptr-record">How to setup a Reverse PTR record</a></li>
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</ul>
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</li>
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<li><a href="#mx-record-for-mail-domain-name">MX record for mail domain name</a><ul>
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<li><a href="#mx">MX record for mail domain name</a><ul>
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<li><a href="#what-is-a-mx-record">What is a MX record</a></li>
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<li><a href="#how-to-setup-the-mx-record">How to setup the MX record</a></li>
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</ul>
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</li>
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<li><a href="#spf-record-for-the-mail-domain-name">SPF record for the mail domain name</a><ul>
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<li><a href="#spf">SPF record for the mail domain name</a><ul>
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<li><a href="#what-is-a-spf-record">What is a SPF record</a></li>
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<li><a href="#how-to-setup-the-spf-record">How to setup the SPF record</a></li>
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</ul>
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</li>
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<li><a href="#dkim-record-for-the-mail-domain-name">DKIM record for the mail domain name</a><ul>
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<li><a href="#dkim">DKIM record for the mail domain name</a><ul>
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<li><a href="#what-is-a-dkim-record">What is a DKIM record</a></li>
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<li><a href="#how-to-setup-the-dkim-record">How to setup the DKIM record</a></li>
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</ul>
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</li>
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<li><a href="#dmarc-record-for-the-mail-domain-name">DMARC record for the mail domain name</a><ul>
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<li><a href="#dmarc">DMARC record for the mail domain name</a><ul>
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<li><a href="#what-is-dmarc-and-how-does-it-combat-phishing">What is DMARC, and how does it combat phishing?</a></li>
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<li><a href="#how-to-setup-the-dmarc-record">How to setup the DMARC record</a></li>
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</ul>
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</div>
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<p><strong>IMPORTANT NOTE</strong>: <code>A</code>, <code>MX</code> records are required, <code>Reverse PTR</code>, <code>SPF</code>,
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<code>DKIM</code> and <code>DMARC</code> are optional but <strong>STRONGLY</strong> recommended.</p>
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<h2 id="a-record-for-server-hostname"><code>A</code> record for server hostname</h2>
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<h2 id="a"><code>A</code> record for server hostname</h2>
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<h3 id="what-is-an-a-record">What is an <code>A</code> record</h3>
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<p><code>A</code> records map a FQDN (fully qualified domain name) to an IP address. This is
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usually the most often used record type in any DNS system. This is the DNS
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@ -102,7 +102,7 @@ mail.mydomain.com. 1800 A 192.168.1.5
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<p>The end result of this record is that <code>www.mydomain.com</code> points to
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<code>192.168.1.2</code>, and <code>mail.mydomain.com</code> points to <code>192.168.1.5</code>.</p>
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<h2 id="reverse-ptr-record-for-server-ip-address">Reverse PTR record for server IP address</h2>
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<h2 id="ptr">Reverse PTR record for server IP address</h2>
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<h3 id="what-is-a-reverse-ptr-record">What is a reverse PTR record</h3>
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<p>PTR record or more appropriately a reverse PTR record is a process of resolving
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an IP address to its associated hostname. This is the exact opposite of the
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PTR record <code>192.168.1.5</code> (your internet public IP address) in their reverse DNS
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zone. Reverse DNS zones are handled by your ISP even though you may have your
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own forward lookup DNS zone that you manage.</p>
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<h2 id="mx-record-for-mail-domain-name">MX record for mail domain name</h2>
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<h2 id="mx">MX record for mail domain name</h2>
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<h3 id="what-is-a-mx-record">What is a MX record</h3>
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<p>Mail Exchanger Record or more commonly known as MX record is an entry in the
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DNS server of your domain that tells other mail servers where your mail server
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<p>The end result of this record is, emails sent to <code>[user]@mydomain.com</code> will
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be delivered to server <code>mail.mydomain.com</code>.</p>
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<h2 id="spf-record-for-the-mail-domain-name">SPF record for the mail domain name</h2>
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<h2 id="spf">SPF record for the mail domain name</h2>
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<h3 id="what-is-a-spf-record">What is a SPF record</h3>
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<p>SPF is a spam and phishing scam fighting method which uses DNS SPF-records to
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define which hosts are permitted to send e-mails for a domain. For details on
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<p><code>-all</code> means prohibit all others.</p>
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<p>There're more valid mechanisms available, please check
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<a href="http://www.openspf.org/SPF_Record_Syntax">OpenSPF web site</a> for more details.</p>
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<h2 id="dkim-record-for-the-mail-domain-name">DKIM record for the mail domain name</h2>
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<h2 id="dkim">DKIM record for the mail domain name</h2>
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<h3 id="what-is-a-dkim-record">What is a DKIM record</h3>
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<p>DKIM allows an organization to take responsibility for a message in a way that
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can be verified by a recipient. The organization can be a direct handler of
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<p>If you want to re-generate DKIM key, or need to generate one for new mail
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domain, please check our another tutorial:
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<a href="./sign.dkim.signature.for.new.domain.html">Sign DKIM signature on outgoing emails for new mail domain</a>.</p>
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<h2 id="dmarc-record-for-the-mail-domain-name">DMARC record for the mail domain name</h2>
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<h2 id="dmarc">DMARC record for the mail domain name</h2>
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<h3 id="what-is-dmarc-and-how-does-it-combat-phishing">What is DMARC, and how does it combat phishing?</h3>
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<p>Quote from <a href="https://dmarc.org/wiki/FAQ">FAQ page on dmarc.org website</a> (it's
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strongly recommended to read the full FAQ page):</p>
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