eMail Verifier verifies the validity of email addresses by quickly communicating with the potential recipient's mail server without actually sending mail. eMail Verifier disconnects as soon as the mail server informs the program whether the address exists or not. Email Verifier can verify over 10 e-mails per second. It can verify single e-mails or huge lists.
Version 3.5.3 adds/changes the following:
"This is the greatest little utility for cleaning up an emailing list full of errors or dead emails . . . a must-have. Works quickly and efficiently."
—Matt Weeks
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Also, if you have an older Mac, be sure to check out the "Classic" applications page for more options.
Finally, take a look at ALEMIA if you think you know that name of an application, but aren't quite sure.
Andrew Starr has a marvelous page of Eudora plug-ins and enhancements that Eudora users must check out. His entire site (known as eMailman) is worthwhile for every email junkie out there.
Graham Orndorff has written a superb collection of articles on setting up email servers and secure email clients on Mac OS X.
Adam Engst has put together a comprehensive overview of email attachment formats that is invaluable for anyone who wants or needs to understand the complexities behind them.
These are applications that are newer and of potential interest, but which I haven't yet selected for permanent inclusion. Have a look, and let me know if you think they deserve to be part of the permanent collection!