OnLetterhead - Branded Email Stationary
OnLetterhead is the premier everyday email branding tool. It plugs directly into Outlook allowing you to brand every email that leaves your office. It installs a toolbar that will allow you to select a design you want to use and even integrate signatures, pictures and dynamic links. ... It does not change the way you send email, it only changes the way your emails will look. ... You will be prompted to register your account. ... By doing so, all of your template information will be assigned to you and you will have full access to over 300 designs at no cost!
http://www.onletterhead.com/shareware/onletterhead_install.exe - 13Mb - Download - Screenshot

HypeMail
HypeMail can be installed as a relay server or as a plugin for Microsoft Exchange 2000+, as a relay server it could be used with various kinds of SMTP mail compliant technologies. It is then used to dvertise, cause awareness or add standard branding onto your companies everyday 1 to 1 emails. ... HypeMail can also identify key phrases or jargon in your email and hyperlink them or provide you with a way to market your products, services and company brand through simple easy to setup keywords. ... HypeMail is built so that every email template that should be applied to outgoing mail from...
http://demo.hypemail.net/HypeMail_V3_3_0.zip - 2Mb - Download - Screenshot