SMTP Filters, Email Sending & Verification

[DW]

A client recently informed me of some sites about email procedures that should be considered for ListMail.  I would appreciate some feedback if you have the time.  Here are the URLs:

http://spf.pobox.com/webgenerated.html

Setting up AOL Feedback Loops and Whitelists (free):
http://postmaster.aol.com/

Bulk Email Senders Info from GMail:
http://www.google.com/gmail/help/bulk_mail.html

Setting up a Sender Policy Framework record (free):
http://spf.pobox.com/wizard.html

Yahoo's DomainKeys tool (free):
http://antispam.yahoo.com/domainkeys

Documentation for Bulk or Duplicative email to Hotmail/MSN:
http://advertising.msn.com/adproducts/Email_BulkDupe.asp

Bonded Sender Program (expensive):
http://www.bondedsender.com