How can I lookup and categorize MX records for a large list of email addresses?
Summary
What email marketers say7Marketer opinions
Email marketer from Server Fault suggests using a shell script with `nslookup` to perform bulk MX record lookups from a list of domains, including a sample script that iterates through a file of domain names and extracts the MX records.
Email marketer from Namecheap explains how to find MX records on the Namecheap dashboard, which they explain how to find, by going to Domains List, clicking 'Manage' next to the domain, and navigating to the 'Advanced DNS' tab.
Email marketer from Experts Exchange mentions the use of online bulk MX lookup tools, while acknowledging that these tools can typically only perform a limited number of lookups and could require a paid service.
Email marketer from Reddit shares a PowerShell script snippet that reads a list of domains from a file, uses `Resolve-DnsName` to fetch MX records for each, and outputs the results to the console.
Email marketer from Stack Overflow provides a Python code snippet using the `dnspython` library to perform MX record lookups, iterating through the results to extract the preference and exchange values.
Email marketer from LinuxQuestions.org forum, suggests using the `host` command in a loop to query MX records from a file containing a list of domains. They provide a basic script structure to iterate through the domains and execute the host command for each one.
Email marketer from GoDaddy offers a step-by-step guide on locating MX records within the GoDaddy DNS zone file. Outlines the process from accessing the GoDaddy account to finding the MX records.
What the experts say4Expert opinions
Expert from Email Geeks shares that she has code that looks up MX records, cleans them up, and categorizes them by MX owner, mentioning the different MX records for domains hosted on outlook.
Expert from Email Geeks shares a link to their GitHub repository (<https://github.com/wttw/dbdnsresolve>) containing code for MX record resolution.
Expert from Word to the Wise explains that correct MX record configuration is essential for mail servers to receive emails, noting that the MX record must point to a valid mail server that is properly configured to accept mail for the domain.
Expert from Spam Resource recommends using online MX record lookup tools as a starting point, but suggests more in-depth analysis using command-line tools like `dig` for advanced categorization and troubleshooting.
What the documentation says6Technical articles
Documentation from MXToolbox explains how to use their online tool to perform an MX record lookup by entering the domain name into the search field on their website.
Documentation from Google Cloud explains how to retrieve MX records for a domain using the `dig` command-line tool, providing a specific command example (`dig domain.com MX`) to query the DNS for MX records.
Documentation from DigitalOcean provides instructions on how to use the `dig` command-line tool to query DNS records, including MX records. Shows the proper syntax for an MX record lookup and interprets the output.
Documentation from Microsoft Learn explains how to use PowerShell's `Resolve-DnsName` cmdlet to query for MX records of a domain, specifying the `-Type MX` parameter to filter the results.
Documentation from CPAN details the method of using the Perl Net::DNS module to conduct MX queries. Shows how to create a resolver, perform an MX query on a domain, and process the returned records to extract the host names and priorities.
Documentation from RFC 974 details the original specification for how mail routing should be implemented with DNS. Details how the MX record is used to map domain names to mail exchangers.