APS, you're not the only one who has been getting this problem with email taking days to arrive.
I regularly send stuff between college and home via email and I always have found that ntl mail either loses it completely (ie. mail disappears into the abyss) or causes it to be delayed by days, which in my view is not acceptable as I rely on it to get files from A to B - it is no use having some work arrive after the day it was due in which has happened many a time...
Here is an DSN from an email I sent earlier this week to someone in college...
It took nearly
2 days to arrive! A carrier pidgeon could have got it there faster!