[support] Mail Submit Page not Found

[Brian Choc]

I've run into a sort of problem with the emailing functions on our 
Drupal (5.7) site.  It's hard to say when this arose, since we don't use 
these features much.

The problem was discovered when my boss tried to email an OG group, as 
she sometimes does, and after clicking "Send email" was taken to "Page 
not found".  Further testing demonstrates this is also a problem sending 
emails via user pages and the site-wide contact form.  Actual receipt of 
sent emails appears to be intermittent, which doesn't help.  The "Page 
not found" error, however, is 100% consistent.  The only evidence in the 
Log appears to be the 500.shtml "page not found" notification with a URL 
such as ".../user/3/contact 
<http://www.t4tcolorado.org/user/3/contact>".  The logged URL works 
until the email form is submitted.

As we don't use this feature often, it's possible this occurred when I 
moved from 5.5 to 5.7 and it wasn't noticed.  That said, I'm not even 
sure where to look.  Thanks for any pointers,

Brian