My LJ notification emails continue to be a hit or miss affair, with the misses taking a strong lead. If you have made a comment to one of my posts/comments and were expecting a reply, chances are I might have missed out on it. I have been getting an increasing amount of spam (almost exclusively layered anigif graphic-based) via my livejournal email account, my marking it as spam might be causing Yahoo Mail to kill legitimate stuff, then again the sheer drop in signal-to-noise ratio in email in general is making a lot of valid messages burn up on entry. Add to that the general flakiness of LJ of late and it's a wonder anything works as it should.
If all else fails, just keep knockin'.
If all else fails, just keep knockin'.