TestMailer
Test Mailer enables you to quickly send an email and monitor or debug all communication with the recipient mail server. There is no need for a smtp server, Test Mailer will act as a mail server itself and lookup the MX records for the recipient. Use the advanced options to create special... - Debug any spam or virus filters that might reject a message in special circumstances. ... Typical use: - An email message is rejected by a mail server, review the complete communication. ... - Save communication reports.
http://www.digiarch.org/download/testmailer.zip - 1Mb - Download - Screenshot

DeskTopResponder
You are selling a digital good, ebook or software, but how are you going to deliver it promptly once your customer has paid? Now with DeskTopResponder ™ running on your own PC you have the answer. Email the 1st response instantly Then have up to four delayed follow-up emails sent, several days... Set filters for SPAM, so that it is sent to its own folder, where you can review and delete it when you have the time - or just set it to AutoDelete if you're feeling swamped! ... Perform electronic order fulfilment Reply to Credit Card receipts, and email your customers a password, either fixed...
http://www.siliconwold.com/downloads/dtr_setup.exe - 603Kb - Download - Screenshot