I do not study the source code, so i can't tell you exactly what 
should be so different with this change. But i have experience that 
with this change everything is OK. Well, we shoud make a deal. 
Tomorrow i'll try work on this problem, i'll try repeat this problem 
on different PC's and i look on the source code. I'll send you my 
result.

Yes, I understand, but it still doesn't make any sense. Your patch 
turns the access key for the lower send button off. At least that's 
what I assume because your patch seems to be reverse. But it doesn't 
make any difference if there is an access key or not when you click 
the button. Not even in the buggiest browser. Not to mention that this 
has *nothing* to do with the sent-mail feature.

Sorry for my poor english knowledge. Try in MSIE SP2 create new 
message in IMP 4.1.2, check  Save a copy in "mail/sent-mail" (for 
example) , write some text and send the message using "Send Message" 
at the bottom of the page. It doesn't work. The message was not sent. 
Tested on two different PC. If i disable the "Save a copy in 
mail/sent-mail", then everything is ok, if i sent mail with Send 
Message" button on the top of the page, then is everything ok even if 
i have option "Save a copy in ..." turn on. Problem is in missing 
condition between the tho round bracket in 
imp-3.1.2/templates/compose/compose.inc file (at my opinion). When i 
fix the line in compose.inc as is for the upper "end Message", then 
everything is ok, problem dismiss. Check the differences at the

compose.inc:

<input name="btn_send_message" type="submit" <?php echo 
Horde::getAccessKeyAndTitle(_("_Send Message")) ?> class="button" 
onclick="return uniqSubmit('send_message');" value="<?php echo _("Send 
Message") ?>" />

and

<input name="btn_send_message" type="submit" <?php echo 
Horde::getAccessKeyAndTitle(_("_Send Message"), true) ?> 
class="button" onclick="return uniqSubmit('send_message');" 
value="<?php echo _("Send Message") ?>" />



Do you understand what i try to say? If don't, then please explain 
what doesnt sense, i'll try to explain it.

This doesn't make *any* sense, and your patch either.

My friend tell me that he can't send message in new IMP 4.1.2 from MS 
Internet Explorer on Windows XP SP2 when he has checked box Save a 
copy in "". I try this and he has true. At that configuration i can't 
send message too. interestig was, that i can send message from the 
Send button, which is on the top of the page, but when i try the 
bottom Send button, process crash. So i look at the source code. 
Problem was with missing "true" after round bracket in 
imp-3.1.2/templates/compose/compose.inc file. Patch is included.

Firefox, Opera - problem doesn't exists.