Merge pull request #240 from mattronix/patch-2
Update prerequisite-dns.md
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@ -99,5 +99,32 @@ It is worth mentioning, that the following suggestions are not a comprehensive l
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**NOTE:** The services may provide you with a TXT record, which you would insert into your DNS records as the provider specifies. This record will give you details about spam-classified mails by your domain. However, please ensure to read the providers documentation from the service you choose, as this process may vary and not all providers may use a TXT record.
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### Email Test for SPF, DKIM and DMARC:
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To test send an email to the email below and wait for a reply:
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check-auth@verifier.port25.com
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You will get a report back that looks like the following:
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```
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==========================================================
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Summary of Results
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==========================================================
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SPF check: pass
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"iprev" check: pass
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DKIM check: pass
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DKIM check: pass
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SpamAssassin check: ham
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==========================================================
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Details:
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==========================================================
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....
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```
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The full report will contain more technical details this is just the first section, we found this to be quite usful for testing both outgoing mail and spam scores.
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### Fully Qualified Domain Name (FQDN)
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[^1]: A **Fully Qualified Domain Name** (**FQDN**) is the complete (absolute) domain name for a specific computer or host, on the Internet. The FQDN consists of at least three parts divided by a dot: the hostname (myhost), the domain name (mydomain) and the top level domain in short **tld** (com). In the example of `mx.mailcow.email` the hostname would be `mx`, the domain name `mailcow` and the tld `email`.
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