Hi just to let you know that an Xtra MTA on 210.54.141.253 has been blacklisted.  This will cause spam filters that use blacklists to detect spam to block mail from this MTA.  Because Xtra have more than one active MTA the symptoms will be that random emails will from time to time not get through to Customers.  I have reported it to Telecom Xtra and they are busy with it.