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HEY - Email at its best, new from Basecamp.
IconViewer - Bot Productions's IconViewer utility allows you to view, copy, and save the icons in a file through its property sheet.
IsMyEmailWorking.com - Round trip email test application.
IconsExtract - Extract icons and cursors stored in EXE, DLL, OCX, CPL files
Unspam.email - Email spam checker and newsletter heatmap prediction.
MailerSend - Better transactional emails for teams.