FYI - Yahoos mail servers seem to be failing again.

[Bryan White]

I have not dug into it yet but on the surface it looks like it did a couple
of months ago.  Back then a yahoo server would stop responding in the middle
of a mail connection, leaving qmail to wait for a time out.  It tends to tie
up large numbers of remotes.  Right now yahoo is consuming 80% of my qmail
remotes and the queue is growing.

Last time it took them 4 or 5 days to get it straightened out.