Changes

   # Contents of KeyTable with both keys

   # Contents of KeyTable with both keys

   selector1._domainkey.hostname.domain-name hostname.domain-name:selector1:/path/to/selector1/private/*.key

   selector1._domainkey.hostname.sugarlabs.org hostname.domain-name:selector1:/path/to/selector1/private/*.key

   selector2._domainkey.hostname.domain-name hostname.domain-name:selector2:/path/to/selector2/private/*.key

   selector2._domainkey.hostname.sugarlabs.org hostname.domain-name:selector2:/path/to/selector2/private/*.key

   # Contents of SigningTable

   # Contents of SigningTable

   *@hostname.domain-name selector1._domainkey.hostname.domain-name

   *@hostname.domain-name selector1._domainkey.hostname.sugarlabs.org

   *@hostname.domain-name selector2._domainkey.hostname.domain-name

   *@hostname.domain-name selector2._domainkey.hostname.sugarlabs.org

Then add a DKIM record for the second selector  

Then add a DKIM record for the second selector