Capetonian
It seems that the mail service provider (mailserver - ccd.co.za) has blacklisted any mail from btinterent IP address ranges.
IP Address Lookup
Possibly IS Internet Solutions SA ...
mail.ultraliquors.co.za
Somewhat unwise of them as I am sure that their customers will be sorry to lose business from clients subscribing to the most dominant fixed line and broadband provider in the UK!
NF