Excite limits connections to 10 per IP and limits number of emails to 10 per connection either connection or sending limits.
Excite launched their postmaster website in early 2010.
Excite does provide a feedback loop.
Excite does not provide a whitelist for senders.
Excite uses the Return Path Certified whitelist in mail delivery decisions. Mail from IPs on the Return Path Certified list will see better delivery at Excite domains.
Excite does not provide any support for senders.