EVIAN CARTIER  I just bought my first mac (Macbook Pro) and for years I've been trying to redirect my mail to: browser to my yahoo mail. I was in the process of buying Yahoo Mail Plus when I stumbled across Yahoo Mailer. I changed my defaults in Apple Mail Preferences and it works like a charm!!! Thanks Jim Thomason!!!  
(Version 1.0.3)

OKDA  Just what I needed. Easily configured in Mail.app and works just fine.  
(Version 1.0.3)

ANONYMOUS  I 'm still trying to get the "Y" icon to change from a dull grey and to open up when I click "check now"...right now, it only opens up when I click "error" , I don't know why though....

Also, the icon is not telling me the number of emails in my Yahoo account....

Very Strange, but I like it...only wish it would do what it's suppose to do.  
(Version 1.0.2)

SJK  I'd recommend using RCDefaultApp instead of More Internet on 10.4.  
(Version 1.0.2)

JIM THOMASON  Using Yahoo Mailer in Tiger is difficult, since Apple now has an account wizard in Mail.app. You can't even get into Apple Mail anymore without configuring an account. So it's hard to set the default reader this way.

This is certainly one of Apple's dumber decisions. Moving it out of System Preferences was bad enough, but then adding that Wizard to Apple Mail is just lousy.

Solution is pretty easy, just download a nifty program called More Internet

It's a preference pane (shows up in system preferences) that allows you to configure the applications used for various protocols. Just scroll down to mailto and choose Yahoo! Mailer and you should be all set.  
(Version 1.0.1)

MIKE  For a full explanation of using Yahoo Mailer with SquirrelMail 1.5.0 (and higher), see this page:

http://www.squirrelmail.org/wiki/en_US/MacintoshMailto  
(Version 1.0.1)

ANONYMOUS  To use this with SquirrelMail 1.5.0 and higher (doesn't work with the 1.4.3a stable version):

http://server.address/WebMail/src/mailto.php?emailaddress=%@

Change the server.address and WebMail to your local settings.

To find these, just go to your usual SquirrelMail login page and look at the URL before "/src/"  
(Version 1.0.1)

KAINE  After switching my default mailer to this app, I get this message in Safari every time I click a mailto: address:

Safari can’t open “mailto:[insert address here]” because Mac OS X doesn’t recognize Internet addresses starting with “mailto:”.

I'm running 10.3.5 and Mail 1.3.9  
(Version 1.0.1)

JIM THOMASON  In case anyone was wanting to use this with Google's gmail, simply launch the program and set this to be the URL:

https://gmail.google.com/gmail?view=cm&cmid=0&fs=1&tearoff=1&to=%@  
(Version 1.0.1)

ANONYMOUS  Sweet!!!!!!!! Thaks mate!!  
(Version 1.0.1)