Adam Barnes wrote:

Why would a mail server do that? I mean, I could understand if they were
firewalling something bad, but this is FANFICTION! I mean, even
including the lemons that are posted once in a blue moon, this list is
rated PG at worst! What, we got a rampant anime hater out there?

It could also be possible that our friend has simply been unsubscribed.
Messages addressed directly to him would come through, but general
fanfic@fanfic.com stuff wouldn't.

The Prime Saggitarian,
Alpha Centauri

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My guess, if they are blocking it, would be due to volume.  Someone had compared incoming traffic and noticed that XX% of incoming E-Mail traffic was 
from Fanfic.com  Therefore someone decides to block it before it 'flooded the
disk'  or some such nonsense.  Yes I know that would be a Dilbertesque solution and completely unnecessary unless this was one of the world's smallest 
server drives, but I think it could happen.

Jim Nutley