Check MX Records for a list of given domains

check_mx_records.py

import dns.resolver

def get_mx_records(domain):
    """Get MX records for a given domain."""
    try:
        answers = dns.resolver.resolve(domain, 'MX')
        mx_records = [(r.exchange.to_text(), r.preference) for r in answers]
        return mx_records
    except (dns.resolver.NoAnswer, dns.resolver.NXDOMAIN, dns.resolver.Timeout) as e:
        return f"Error retrieving MX records for {domain}: {str(e)}"

def main(domains_file):
    """Read domains from a file and print their MX records."""
    try:
        with open(domains_file, 'r') as file:
            domains = file.readlines()
        
        for domain in domains:
            domain = domain.strip()
            if domain:  # Ensure the domain is not empty
                mx_records = get_mx_records(domain)
                print(f"Domain: {domain}")
                if isinstance(mx_records, str):
                    print(mx_records)
                else:
                    for record in mx_records:
                        print(f"  MX: {record[0]}, Priority: {record[1]}")
                print()
    except FileNotFoundError:
        print(f"Error: The file {domains_file} was not found.")
    except Exception as e:
        print(f"An unexpected error occurred: {str(e)}")

if __name__ == "__main__":
    # Path to the file containing the list of domains (one per line)
    domains_file = 'domains.txt'
    main(domains_file)