At <http://campaign.r20.constantcontact.com/render?llr=9th5sujab&v=001g7xYn3eIW2MhNIW0Xnv-Caxhe-63bhDTumzmhfVkPtHlvo4Ve5zDQtf3Ynq7vuE3-8-X-IWyBih7wo3vn6hXERU17tv8F1giJ4s0lJHgXoU%3D>, there is a mailto link at the bottom of the Web page. Selecting the link launches a compose window in Thunderbird. The compose window has my From: and Reply-To: address (both the same), but the To: address is blank. The mailto: link is <mailto:email@example.com>.
Works fine for me (TB 24.0.1 on Windows 7).
Windows 7 (x64) Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.0.1 1. Launch Thunderbird in Safe Mode. 2. Launch a browser for which Thunderbird is the default E-mail client. 3. Go to <http://www.latimes.com/>. 4. Select any news story that ends with a mailto link to the reporter's E-mail. (Most do.) 5. Place the cursor over the mailto link and observe the construct of the link. If you do not have a Status bar to display the link, right-click on the link and select Copy Link Location (NOT Copy Email Address) and paste the result in a text editor window. 6. Select that E-mail link. The mailto link appears properly constructed. The Thunderbird Write window shows my E-mail address for both From: and Reply-To:; however, it does not show an E-mail address for To:. I tested this with both SeaMonkey 2.21 and Internet Explorer 10.0.9200.16720 and got the same result.
I followed the above steps on Windows 7 with Thunderbird 24.0.1 in safe mode (with a Reply-To address set on my default identity) coming from both Firefox 24.0 and Internet Explorer 10.0.9200.16721 and everything works fine for me. I can only assume that there's something broken in your TB profile (or maybe the Windows registry), since those are the only differences I can think of that would cause this.
Probably a DUP of Bug 913493, but I'm not 100% sure so leaving open
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.1.0 Re comment #3: I do not see any user-oriented way to create a new profile to test the conjecture that this might be a problem with my current profile. Since my PC is new with a new installation of Windows 7 (x64), I doubt there is a problem with my Windows 7 registry. Re comment #4: I am not familiar with MAPI and thus cannot assess whether this is the same as bug #913493. Because this bug describes the problem in terms oriented towards end-users, however, I suggest this bug remain open and not closed as a duplicate of bug #913493. Otherwise, other end-users might create additional bugs about this same problem.
Yes, I tried a clean, new profile. The problem does not exist there. Now my problem is that I do not know how to isolate what in my existing profile causes this problem. I started to create a new profile that would include all my old E-mail, newsgroup, and RSS messages. That proved too daunting. I will go to the mozilla.support.thunderbird newsgroup to see if someone can help me.
Created attachment 8380249 [details] user.js Oops! I spent over six hours creating a new, clean profile in which I used [Tools > Options] to setup the new profile similarly to the old one. I then created my two E-mail accounts, three news server accounts, and list of RSS feeds. I also copied into the new profile the user.js file that I have been using; it is attached to this bug report. Now the same problem occurs in the new profile, even in Safe Mode (although I did not install any extensions in the new profile). Note that the problem occurs when selecting a mailto: link on a Web page in a browser, whether I use IE 10 or SeaMonkey 2.24. This is NOT about selecting a mailto: link on an HTML-formatted E-mail message in Thunderbird.
Get rid of this line: user_pref("network.protocol-handler.external.mailto", true);
Re comment #8: Wheee!! It works. That line was carried over from the user.js in one of my SeaMonkey profiles. It definitely should not have been. It tells SeaMonkey not to use its own mail-news component. I do that so that I do not lose my current mail-news session if I change SeaMonkey profiles (something I might do several times in an hour). Again: RESOLVED