Excite

Delivering to
Excite limits connections to 10 per IP and limits number of emails to 10 per connection either connection or sending limits.

Postmaster pages
Excite launched their postmaster website in early 2010.

Feedback loop
Excite does provide a feedback loop.

Whitelist
Excite does not provide a whitelist for senders.

Certification Services
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.

Support for Senders
Excite does not provide any support for senders.

Known spamfilters
Excite does use some commercial spamfilters or blocklists. The specific lists have not been confirmed as of this writing.