Acrobat 9 Pro " An error occurred while sending mail"

Question

Dear Gurus:
Free ice cream to the person with the answer that works.      I use Vista OS, 32 bit;    IE (Primary) and Mozilla;   Outlook E-mail (primary) and Windows Mail.  The preceding has been the case for the last two years so "nothing has changed".    I used Adobe Acrobat 9 Pro for two years and designed a number of interactive forms and used the functionality as much as possible.   Overall a good experience with Pro 9
Case in point, I designed an interactive employment application that was regularly used, updated and re-released over a period of about two years without incident.  It was set up to be completed online by employment applicants.  Once completed, they would click to  "e-mail the office"  the completed application then close the document.    It was set up with the button to send a form, and more precisely to send the form as .FDF to the mailto: address#1; address #2.   Again it worked fine using either Mozilla or IE until last week.      As usual, I made some minor edits to the existing body fields and left the buttons alone sine there was no need to bother them.
I emailed  the revised  .PDF document to   "the web guy" who added it to the website- like all the times before.     I went online to  "test it" as usual so I filled it out.   When I click the button to send form to office, the option comes up to select the email client.   I use Outlook so I selected "Desktop E-mail Application",  click  OK  and then I immediately get the message  "An error has occurred while sending mail".      In the past without fail, the Outlook would open after 1-3 seconds and attach the   .FDF file with the normal  .FDF and data jargon.  no problem...      Also, I am aware of extending features to Reader and the licensing issue, but I doubt that is an issue.....
So, before I posted here I tried a few things:
A-  I tried opening the source  .PDF application locally on my PC and filled it out. I clicked the button to "sent the file" to myself.    To be clear this was not posted on the website, but it did open Outlook, create the email, add the .FDF and sent it to me.       HHHMMMM so it works locally....
B-  Next, I started fresh with a blank adobe document page and added two items:  1- a text field and a new email submit button I created to send the data via FDF.    I set it up, it worked fine when I tested it locally on the PC and created the .FDF file and the Outlook email and I sent it to myself.     Then  I took this same little test file and added it to a different website I have access to, I re-published the site,  ccessed the form and  no dice......    I got the same message,  " an error occurred while sending mail"  when I clicked OK to use the Desktop Email Application.
C- I read other posts and Googled for about 6 hours yesterday and  now I am missing clumps of hair.
So, it seems something "happened" that will not let the email be created from an existing form; or a NEW form that are available for use on a website;  but BOTH  work just fine if accessed on a local PC. 
Please , and thank you..
Brian P.

Answer 1

Hi Bill,
Thank you for your follow up.       I'm not sure what you mean by,  "did I do a comparison to the original".    If you're asking whether I'm sure the .PDF and the .FDF are the "same" documents, they are...  however the problem is even if they were entirely different forms, my issue is once the submit form button is clicked, Outlook fails to initialize and attach the   .FDF file .
I mentioned how I tried to recreate the "error" by building a new form from scratch in order to eliminate all the possible variables of having a bug in the form that had been updated so many times before without incident.   Even with the new form having just one text field and one submit form button,  it worked as needed when I used the .PDF file locally right from my PC by  filling out the field and submitting the form's  .FDF data to myself.      It opened the Outlookprogram, created the mail and attached the .FDF file.     I clicked "send" and away it goes  from "me" to "me" and I was able to open the email, click the .FDF then browse to the .PDF source form so the files could extract into the   .PDF.    All normal and all Okay ,  like 100 times before using the WEB, but not now... .
Today,  even that simple form with one field and one submit button encounters the same  "An error has occurred while sending mail"  message upon clicking on the web based submit button.     The option comes up to let me select the email server and when I click  "OK" , the error notice comes up...    grrrrrrrrrrrrr
In short, when the form is used in a website environment, it doesn't want to create the outgoing email with the .FDF file attachment.      Normally, it worked like a peach.
?? I dunno
BP