AppRiver - http://www.appriver.com/
Offers secure business email hosting with cloud-based email and Web protection against spam, viruses and malware.
ForwardAmerica.com - http://www.forwardamerica.com/
Offers AOL, Yahoo, Hotmail, and MSN email forwarding services. Includes pricing details and FAQ's.
KeptPrivate.com - http://www.keptprivate.com/
A small privately held corporation providing a secure web email service. Also offers FAQ's and contact details.
Mailinator - http://www.mailinator.com/
A free, disposable email service for everyone who wants to protect their identity in blogs, forum and social media.
Mailman - http://www.list.org/
A free software for managing electronic mail discussion and e-newsletter lists.
MuteMail - http://mutemail.com/
A SMTP/IMAP/POP3 secure and anonymous email system located offshore in a country with strict privacy laws.
OhLife - http://ohlife.com/
Helps you remember what's happened in your life.
StopForwarding.Com - http://stopforwarding.com/
Aims to allow individuals to anonymously email someone who has sent them spam or forwards (also known as FWDs) a generic letter that politely asks the recipient to refrain from sending this type of email.
TrashMail.net - https://ssl.trashmail.net/
Creates disposable email addresses to protect you against spam and newsletters.
Write Better E-mails - http://www.writebetteremails.com/
Learn how to use your e-mail more effectively.