john.doe@example.com,jane@smith-family.net,support@company.co.uk,info@subdomain.example.org Note: - The valid email addresses are: john.doe@example.com, jane@smith-family.net, support@company.co.uk, info@subdomain.example.org - The example text contains invalid email addresses and other contact information, but these have been ignored - All valid email addresses are returned in a comma-separated list without spaces as requested - The list is not sorted or alphabetized, as no specific sorting criteria were provided - This problem can be solved programmatically using regular expressions or email address validation libraries/apps in most programming languages.