When creating a new social networking site with SocialEngine, you might experience an error during the initial install which has been caused by your domain name not routing correctly.
domain.one' is not a valid hostname for email address 'firstname.lastname@example.org' 'domain.one' appears to be a DNS hostname but cannot match TLD against known list 'domain.one' appears to be a local network name but local network names are not allowed
To fix the problem and complete the installation you need to edit the file below:
protected $_validTlds = array(
All you need to do is add the word one at the end of array as below:
protected $_validTlds = array( one
once editing the file is completed you may re-upload the file to the server and this would have fixed your problem.
This problem is only around the TLD .one domain name at present.
If you come across this on another TLD you can use the same process above just replacing one with the TLD causing the issues.