As I have had to put in place work arounds to get my email working when someone send email addressed to me at ......@bigfoot.com. I have access to more information.
Interestingly - when I send mail to my bigfoot.com address my mail system logs the following :
IP address 211.115.216.228 found in DNS blacklist SORBS DNSBL
IP address 211.115.216.225 found in DNS blacklist SORBS DNSBL
reverse DNS Lookups reveal:
211.115.216.228 PTR record:
mail-kr.bigfoot.com
211.115.216.225 PTR record:
mail-kr.bigfoot.com
A quick look on
http://www.dnsbl.nl.sorbs.net/lookup.shtml brings up
Currently active and flagged to be published in DNS
It appears therefore that Bigfoot.com appears in a blacklist and NTL are just droppping the mail requests.