Domain Configuration Check
This article relates to the Domain Configuration Check tool. The Domain Configuration Check is a free online tool which performs a comprehensive check of your domain's DNS, email and other configuration.
Simply enter your domain name (eg. example.com) and let the Domain Configuration Check tool start gathering its results. To get started, go to the Domain Configuration Check.
Specific Name Server Configuration Tests - Part 2
A Record
Checks that your domain has valid A record(s), and doesn't contain a CNAME record. A CNAME (canonical name) would cause an extra lookup and should not be used to resolve the domain name.
Each A record is shown along with the country that the IP address is assigned to shown in square brackets.
www A Record
Shows the A record(s) for the www subdomain of your domain. This is for information only. CNAME records are valid here. If a CNAME record is found it will follow the record until an A record is found.
Each A record is shown along with the country that the IP address is assigned to shown in square brackets.
MX Record
Shows any MX records for your domain. If no MX records are found, it is assumed that your domain is not used for email, and the following email checks are skipped.
MX records should not point to CNAME records as this would cause an extra lookup.
All MX records found are displayed in the output, along with the IP address for the mail server listed in the MX record. Also, the country that the IP address is assigned to is shown in square brackets.
SPF Record
Checks to see if you have an SPF (Sender Policy Framework) record for your domain. It is recommended that you have an SPF record if you use your domain for sending email. A valid SPF record helps SPAM filters to identify SPAM.
SPF records are traditionally stored in a generic TXT record, but nowadays a specific SPF DNS record can be used instead.
SPF records stored in TXT or SPF records will be detected and shown here.
Note that this check doesn't actually validate the contents of your SPF record.
Check Mail Server Greeting
Checks that a connection to the mail server can be established and that it returns a mail server greeting message.
The mail server greeting message is displayed here.
If a connection to the mail server cannot be established, your domain may not be able to receive emails.
Check Postmaster Mailbox
Checks to see if you have a postmaster email address for your domain.
The postmaster address should be used to contact the administrator of your mail server. RFC 2142 requires that every domain that supports email has a postmaster address.
Errors that occur during the sending of email are often sent to the postmaster mailbox. If this mailbox doesn't exist, other errors may occur.
Check Abuse Mailbox
Checks to see if you have an abuse email address for your domain. This is recommended in RFC 2142.
The abuse mailbox can be used by people to highlight inappropriate emails, or report phishing or spam activity.