Changes have been made in Git for this ticket:

Bug #8413: Fix regex to capture some malformed img tags

http://git.horde.org/diff.php/imp/lib/Mime/Viewer/Html.php?rt=horde-git&r1=eb76b66a06e626568552dc22adb3103f53e596bd&r2=9fcdba88dd23b8980d634b5d39d4af9499041235

That img tag had 2 src attributes, and had the info in the first 
attribute.  The regex was too greedy and was ignoring all text in the 
tag between '<img' and the final 'src=' text.  Solution was to make 
that part of the regex ungreedy.



An img tag with multiple src attributes that doesn't contain a correct 
source link in the first src attribute will not display the image at 
all, even after clicking on Display these images.  But absent a 
super-complex preg regex, this is acceptable (after all, the message 
is broken).



Running tidy fixed this issue without the need for the regexp change.

Changes have been made in CVS for this ticket:

http://cvs.horde.org/diff.php/imp/lib/MIME/Viewer/html.php?rt=horde&r1=1.75.2.39&r2=1.75.2.40&ty=u

adding an example message

The image shows up for me. Using Safari - not sure if this might be 
browser-specific.

I can't reproduce this, with either IMP 5 or IMP 4.3.5.  In IMP 5, 
nothing is displayed.  In IMP 4.3.5, I get the option to unblock 
images, but nothing is displayed by default.

Choosing to block images in HTML mail, and receiving an email with the 
following will still render the image:

<img src=http://www.google.pt/intl/en_com/images/logo_plain.png 
onload=`" src=`>