My WHM tells me that imap has failed, and I think that its right. The problem is that /etc/init.d/xinetd restart shows no errors, and neither does /etc/rc.d/init.d/xinetd status, /scripts/restartsrv_inetd, /scripts/restartsrv_xinetd, /scripts/restartsrv_imap. ps shows xinetd running, but anything that uses imap shows connection refused, like squirrelmail.
cat /etc/xinet.d/imap
# Converted by inetdconvert
service imap
{
socket_type = stream
protocol = tcp
wait = no
user = root
server = imapd
disable = no
}